动词
中文翻译：Unknown
同义词：
['close contact', 'touch base', 'be in close contact with']
例句：
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1. The two countries have been closely connected for decades.
这两个国家几十年来一直紧密相连。
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2. They made a close contact after the meeting.
会议后他们建立了密切联系。
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3. He's been in close contact with his sister since she moved to another city.
自从她搬到另一个城市后，他一直和她保持着密切联系。