动词短语
中文翻译：密切接触
同义词：
['touch', 'get close to', 'be in close contact with']
例句：
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1. They need to maintain a close contact with their clients.
他们需要与客户保持密切联系。
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2. The two countries have been in close contact since the outbreak of the pandemic.
自疫情爆发以来，这两个国家一直保持密切联系。
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3. The scientists worked closely together to solve the problem.
科学家们紧密合作以解决问题。