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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 had dinner with him Saturday,
星期六我与他一起吃晚餐，
It is so necessary for you to have some rest and relaxation.
你特别需要休息和娱乐。
It looks as if it hasn't been washed following the instructions.
这看起来没按说明来洗。