A clutch, comprising a drive disc, a driven disc, and a friction plate unit capable of engaging or disengaging the drive disc with or from the driven disc, wherein the friction plate unit comprises a first friction plate assembly and a second friction plate assembly, wherein the clutch further comprises a pressing unit configured to engage or disengage the drive disc with or from the driven disc selectively by the first friction plate assembly alone or by a combination of the first friction plate assembly and the second friction plate assembly, wherein the first friction plate assembly comprises at least one pair of first outer friction plate and first inner friction plate that are capable of abutting with each other, and wherein the first outer friction plate is rotatable in synchronization with the driven disc, and the first inner friction plate is rotatable in synchronization with the drive disc, and the second friction plate assembly comprises a basic outer friction plate that can abut with a first inner friction plate of the first friction plate assembly that is adjacent to the side of the second friction plate assembly, the basic outer friction plate being rotatable in synchronization with the driven disc, characterized in that the clutch comprises a bushing fixedly connected or integrally formed with the drive disc, and the pressing unit comprises an outer hub movable in an axial direction of the bushing and synchronously rotatable with the bushing, and a spring assembly provided on the outer hub, wherein the outer hub is movable in a direction toward the first friction plate assembly in the axial direction of the bushing to engage the first outer friction plate with the first inner friction plate of the first friction plate assembly by pressing the spring assembly; and wherein based on the engagement of the first outer friction plate with the first inner friction plate of the first friction plate assembly, the outer hub can continue to move in a direction toward the first friction plate assembly in the axial direction of the bushing to engage the basic outer friction plate of the second friction plate assembly with the first friction plate assembly by pressing the spring assembly. the friction plate unit comprises a first friction plate assembly and a second friction plate assembly, wherein the clutch further comprises a pressing unit configured to engage or disengage the drive disc with or from the driven disc selectively by the first friction plate assembly alone or by a combination of the first friction plate assembly and the second friction plate assembly, wherein the first friction plate assembly comprises at least one pair of first outer friction plate and first inner friction plate that are capable of abutting with each other, and wherein the first outer friction plate is rotatable in synchronization with the driven disc, and the first inner friction plate is rotatable in synchronization with the drive disc, and the second friction plate assembly comprises a basic outer friction plate that can abut with a first inner friction plate of the first friction plate assembly that is adjacent to the side of the second friction plate assembly, the basic outer friction plate being rotatable in synchronization with the driven disc, characterized in that the clutch comprises a bushing fixedly connected or integrally formed with the drive disc, and the pressing unit comprises an outer hub movable in an axial direction of the bushing and synchronously rotatable with the bushing, and a spring assembly provided on the outer hub, wherein the outer hub is movable in a direction toward the first friction plate assembly in the axial direction of the bushing to engage the first outer friction plate with the first inner friction plate of the first friction plate assembly by pressing the spring assembly; and wherein based on the engagement of the first outer friction plate with the first inner friction plate of the first friction plate assembly, the outer hub can continue to move in a direction toward the first friction plate assembly in the axial direction of the bushing to engage the basic outer friction plate of the second friction plate assembly with the first friction plate assembly by pressing the spring assembly.