1. diagnose vt. 诊断; 判断
例句：What more will you want to know to diagnose this problem?
要弄清这个问题，你还需要知道些什么？

2. infect vt.使受影响，感染; 传染
例句：I didn't pay any attention to it Because I never infect.
我对这事毫不注意，因为我从来未受感染。

3. appear vi.发表; 出现，显现
例句：They appear to be very sensitive to mildly corrosive environments.
它们似乎对轻度的腐蚀环境非常敏感。

4. explain vt.讲解，解释
例句：He made up a story to explain why he was absent.
他编造了一个故事为他的缺席辩解。

5. identify vt.确定; 识别，认出
例句：Intellectuals should identify with the workers,peasants and soldiers.
知识分子应该和工农兵打成一片。

6. recognize vt.承认; 识别; 认出
例句：I recognize that she works harder than I do.
我认识到她比我用功。
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