Bad-mouth v. 诽谤，说坏话
Divorced parents shouldn&`&t bad-mouth each other in front of the kids.
离异的父母不应该在孩子们面前说彼此的坏话。

leave a bad taste in sb&`&s mouth
给某人留下不愉快的记忆
The way he was talking to the old man left a bad taste in my mouth.
他和那个老人说话的方式给我留下了不好的印象。

Big mouth 多嘴的人
God you&`&ve got a big mouth! Don&`&t you ever stop talking about other people&`&s business?
天呐！你真是个多嘴的人！你能不能不谈别人的事情？

Mouthwatering （食品）令人垂涎的
They’ve got a lot of mouthwatering desserts at the party last night.
昨晚的聚会上有很多让人垂涎的甜点。

By word of mouth
口头上地，口口相传地
A: "How did you hear about our bakery?”
你从哪知道我们面包店的？
B: "Oh, by word of mouth. My dad told me about it.”
听说的。我爸告诉我的。

今日挑战
John knocked at the door for nearly five minutes ___ his wife opened.
A. when
B. before
C. while
【翻阅上一期内容即可查阅正确答案】
【下一期内容的正确答案解析】
[答案] B正确；后面是一个省略了that的定语从句，这句话变为陈述句就很好理解：This is the school (that) some German friends visited last week. 其中，学校是特指，所以前面一定要加the，另外where不能在从句中做宾语，只能做地点状语，所以D错误；