Appear too reserved. As Americans are generally more exuberant than their European colleagues, they may equate reserve with lack of enthusiasm.

显得太保守。由于美国人比欧洲的同事普遍热情，他们可能把保守等同于缺乏热情。

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Rather, he can often appear reserved, cautious, like he's afraid to give away too much.

他通常会表现出保守谨慎，以防泄露太多信息的样子。

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