题目内容

Your emotionless facial expressions may totally bore your listeners down.

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Using technical and abstract words in an informative speech is useful since it demonstrates your expertise on the topic.

活八字结比八字结更不容易解开。

单圈八字环结编打的绳环可以双向受力。

外科结是一种被外科医生使用的伤口缝合绳结。