现在懂中文的老外越来越多了，在公共场合千万别随便议论外国人，说不定你说什么人家都听得懂，搞不好还要回敬你一句。
xiànzài dǒng Zhōngwén de lǎowài yuèláiyuè duō le ，zài gōnggòngchǎnghé qiānwàn bié suíbiàn yìlùn wàiguórén ，shuōbudìng nǐ shuō shénme rénjiā dōu tīng de dǒng ，gǎobuhǎo hái yào huíjìng nǐ yī jù 。
These days, more and more foreigners understand Chinese. When you're out in public and around foreigners, by all means, don't talk about them, otherwise they may understand you and maybe even reply.