to access additional functionality. The modified functions available when holding down keys during drag-and-drop are indicated by the mouse pointer changing form. When selecting files or other objects, the modifier keys can extend the selection - the functions are explained where applicable.
（偶尔使用）等键来访问附加功能。拖放时按住这些键是否可以提供修改功能，这由鼠标指针的形状变化来指示。在选择文件或其他对象时，修改键可以扩展选择 - 这些功能将在适当的位置加以说明。