they have been friends since childhood
他们从小就是朋友
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They have been friends since childhood.
他们从幼时起一直是好朋友。
youdao
They have been friends since childhood. prep.
They have been good friends since childhood.
他们从一小儿起就一直是好朋友。
《新英汉大辞典》
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