你是資產階級文藝家，你就不歌頌無產階級而歌頌資產階級；你是無產階級文藝家，你就不歌頌資產階級而歌頌無產階級和勞動人民：二者必居其一。
你是资产阶级文艺家，你就不歌颂无产阶级而歌颂资产阶级；你是无产阶级文艺家，你就不歌颂资产阶级而歌颂无产阶级和劳动人民：二者必居其一。
nǐ shì zī chǎn jiē jí wén yì jiā ， nǐ jiù bù gē sòng wú chǎn jiē jí ér gē sòng zī chǎn jiē jí ； nǐ shì wú chǎn jiē jí wén yì jiā ， nǐ jiù bù gē sòng zī chǎn jiē jí ér gē sòng wú chǎn jiē jí hé láo dòng rén mín ： èr zhě bì jū qí yī ． If you are a bourgeois writer or artist, you will eulogize not the proletariat but the bourgeoisie, and if you are a proletarian writer or artist, you will eulogize not the bourgeoisie but the proletariat and working people: it must be one or the other.
Examples (Wiktionary)
Mandarin
你是资产阶级文艺家，你就不歌颂无产阶级而歌颂资产阶级；你是无产阶级文艺家，你就不歌颂资产阶级而歌颂无产阶级和劳动人民：二者必居其一。
你是資產階級文藝家，你就不歌頌無產階級而歌頌資產階級；你是無產階級文藝家，你就不歌頌資產階級而歌頌無產階級和勞動人民：二者必居其一。
nǐ shì zī chǎn jiē jí wén yì jiā ， nǐ jiù bù gē sòng wú chǎn jiē jí ér gē sòng zī chǎn jiē jí ； nǐ shì wú chǎn jiē jí wén yì jiā ， nǐ jiù bù gē sòng zī chǎn jiē jí ér gē sòng wú chǎn jiē jí hé láo dòng rén mín ： èr zhě bì jū qí yī ．
If you are a bourgeois writer or artist, you will eulogize not the proletariat but the bourgeoisie, and if you are a proletarian writer or artist, you will eulogize not the bourgeoisie but the proletariat and working people: it must be one or the other.