Examples
nǐ你hěn很róng yì容易bǎ把mǔ yǔ母语shuō说de得tōng shùn通顺liú chàng流畅，què却hěn很róng yì容易bǎ把fēi非mǔ yǔ母语shuō说de得bú不zì rán自然。
你很容易把母语说得通顺流畅，却很容易把非母语说得不自然。
It's very easy to sound natural in your own native language, and very easy to sound unnatural in your non-native language.
请把发给你的那张单子看一下，再确认一下所有的句子都很通顺。
Read the list we sent you and check that all the sentences sound natural to you.