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[化] 反馈作用
🧩 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 would like to know about your honeymoon travel packages.
我想要知道你们办的有关蜜月旅行计划。
If it doesn't rain tomorrow, we'll have a picnic.
如果明天不下雨，我们就去野餐。
You might as well throw your money away as spend it in gambling.
你与其把钱花在赌博上，不如把它丢掉的好。