名词
中文翻译：密友
同义词：
['best friend', 'dear friend', 'close friend']
例句：
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1. She has a close friend who helps her with her studies every day.
她有一个亲密的朋友，每天帮助她学习。
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2. They have been best friends for over 30 years.
他们是最好的朋友，已经在一起30多年了。
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3. He confided in his closest friend about his plans for the future.
他向他最亲密的朋友透露了他的未来计划。