(大衣或口袋等上木质或塑料的)栓扣钉,棒形纽扣,套索扣a short piece of wood, plastic, etc. that is put through a loop of thread to fasten sth, such as a coat or bag, instead of a button
2.
转换键;切换键a key on a computer that you press to change from one style or operation to another, and back again
v.
1.
[i][t]
(两种状态之间)切换,转换to press a key or set of keys on a computer keyboard in order to turn a feature on or off, or to move from one program, etc. to another