be unacquainted with sth 不了解某事
If a Chinese is invited to a meal, he will try to find an opportunity to give a return banquet to the inviter, otherwise, he would be regarded as unacquainted with the ways of the world.
如果有人请中国人吃饭,这个中国人就会找机会回请,否则,他会被看成没有人情。
Unacquainted people are more easily to be trusted, because they'd never cheated us.
我们容易相信那些素不相识的人,因为他们从未欺骗过我们。
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