英语博客-北美风情 56、Expression: Once in a blue moo
时间：2019-01-28 作者：英语课 分类：英语博客-北美风情
英语课
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How often do you go to the beach? Everyday? Sometimes? Once in a blue moon? We use the expression once in a blue moon to talk about the frequency 1 of something or how often you do a certain activity. We hope you listen to Culips more than once in a blue moon!
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收听单词发音 1
frequency
n.次数，频率；经常发生，频繁
参考例句：
If we can know their frequency we will monitor their talking.如果我们知道他们的频率,我们就能监听他们的谈话。
The tanks broke down with increasing frequency.坦克越来越频繁地熄火。