1. diagnose vt. 诊断; 判断
例句：The soldiers were diagnosed as having flu
这些士兵经诊断患了流感。

2. recognize vt.承认; 识别; 认出
例句：The receptionist recognized him at once
接待员一眼就认出他了。

3. solve vt.解决; 解答; 解释
例句：Their domestic reforms did nothing to solve the problem of unemployment
他们的国内改革未能解决失业问题。

4. infect vt.使受影响，感染; 传染
例句：A single mosquito can infect a large number of people.
一只蚊子就可以感染很多人。
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