这个单词怎么理解?Since 1939,numerous studies have been conducted to determiSince 1939,numerous studies have been conducted to determine whether smoking is a health hazard.句中的conduct怎么理解?

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这个单词怎么理解?Since 1939,numerous studies have been conducted to determiSince 1939,numerous studies have been conducted to determine whether smoking is a health hazard.句中的conduct怎么理解?
这个单词怎么理解?Since 1939,numerous studies have been conducted to determi
Since 1939,numerous studies have been conducted to determine whether smoking is a health hazard.
句中的conduct怎么理解?

这个单词怎么理解?Since 1939,numerous studies have been conducted to determiSince 1939,numerous studies have been conducted to determine whether smoking is a health hazard.句中的conduct怎么理解?
“实施,做”的意思.

这里的conduct studies可以理解为“做出研究”

从1939年开始,许多的研究已经开始朝着吸烟是否是个健康危害发展。
这里的conducted to 应理解为朝某方向发展的意思。

自1939年起,进行了数不清的研究以确定吸烟是否有害健康。
conduct做动词,表示 进行 的意思