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封底；表后背
🧩 词语组成解析
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[bæk]
n. 背，背部;背面，反面;后面，后部;（椅子等的）靠背;
vt. 使后退;支持;加背书于;下赌注于;
vi. 后退;倒退;
adj. 背部的;后面的;以前的;拖欠的;
adv. 以前;向后地;
🗣️ 情景例句
I can't put it strongly enouth, I need to make a sale before the end of the week.
我郑重宣布，我要在本周末前搞一次大减价。
This is the last time I'll ever ask you to do anything for me.
这是我最后一次要求你为我做事情。
He agreed that a train did come into the station at the time on the paper and that it did stop, but only to take on mail, not passengers.
搬运工说，正如纸条所说，确有一趟火车在那个时刻到站，但它只停站装邮件，不载旅客。