Unstack
vi. 退栈, 出栈
🗣️ 情景例句
I've been thinking about it for weeks now.
为这事我想了几个星期。
I must have dialed a wrong number.
我一定拨错号了。
Had he worked harder, he would have gotten though the exams.
如果他努力了的话，他就会通过考试的。