An adjustment mechanism, comprising: a first adjustment device including: a first component; a second component; a first adjusting element disposed on the first component; and a first structure disposed on the second component; wherein the first adjusting element and the first structure include a first feature and a second feature respectively, and the first feature and the second feature correspond to each other; and that when the first adjusting element is operated, the first feature and the second feature work with each other to longitudinally displace, and thereby adjust, the second component and the first component with respect to each other, the adjustment mechanism further comprising a second adjustment device, the second adjustment device including: a third component; a second adjusting element disposed on the second component; and a second structure disposed on the third component; wherein the second adjusting element includes an adjusting portion; wherein when the second adjusting element is operated, the adjusting portion and the second structure work with each other to transversely displace, and thereby adjust, the second component and the third component with respect to each other; wherein the adjustment mechanism is configured for use with a slide rail; wherein the first component is connectable to an object carried by the slide rail, and the third component is connectable to the slide rail; wherein the first feature and the second feature are configured to work with each other to convert a rotation of the first adjusting element into a longitudinal displacement of the first component with respect to the second component, thereby adjusting a longitudinal position of the object with respect to the slide rail; and wherein the adjusting portion and the second structure are configured to work with each other to convert a rotation of the second adjusting element into a transverse displacement of the second component with respect to the third component, thereby adjusting a transverse position of the object with respect to the slide rail; wherein the first adjusting element is a turning wheel, the first structure is a rod, the first structure is substantially longitudinally disposed with respect to the second component, and the first adjusting element is configured to be operated by rotation about an axis defined by the first structure; characterized in that the second adjusting element is a turning wheel, the second structure is a projection, the adjusting portion of the second adjusting element is a generally spiral guide groove, and the second structure is in the guide groove. a first adjustment device including: a first component; a second component; a first adjusting element disposed on the first component; and a first structure disposed on the second component; a first component; a second component; a first adjusting element disposed on the first component; and a first structure disposed on the second component; wherein the first adjusting element and the first structure include a first feature and a second feature respectively, and the first feature and the second feature correspond to each other; and that when the first adjusting element is operated, the first feature and the second feature work with each other to longitudinally displace, and thereby adjust, the second component and the first component with respect to each other, the adjustment mechanism further comprising a second adjustment device, the second adjustment device including: a third component; a second adjusting element disposed on the second component; and a second structure disposed on the third component; a third component; a second adjusting element disposed on the second component; and a second structure disposed on the third component; wherein the second adjusting element includes an adjusting portion; wherein when the second adjusting element is operated, the adjusting portion and the second structure work with each other to transversely displace, and thereby adjust, the second component and the third component with respect to each other; wherein the adjustment mechanism is configured for use with a slide rail; wherein the first component is connectable to an object carried by the slide rail, and the third component is connectable to the slide rail; wherein the first feature and the second feature are configured to work with each other to convert a rotation of the first adjusting element into a longitudinal displacement of the first component with respect to the second component, thereby adjusting a longitudinal position of the object with respect to the slide rail; and wherein the adjusting portion and the second structure are configured to work with each other to convert a rotation of the second adjusting element into a transverse displacement of the second component with respect to the third component, thereby adjusting a transverse position of the object with respect to the slide rail; wherein the first adjusting element is a turning wheel, the first structure is a rod, the first structure is substantially longitudinally disposed with respect to the second component, and the first adjusting element is configured to be operated by rotation about an axis defined by the first structure; characterized in that the second adjusting element is a turning wheel, the second structure is a projection, the adjusting portion of the second adjusting element is a generally spiral guide groove, and the second structure is in the guide groove.