剩余产品

zhèng zhì kè shang lǎo shī gěi wǒ men jiǎng le bì yào chǎn pǐn hé shèng yú chǎn pǐn de bù tóng

政治课上，老师给我们讲了必要产品和剩余产品的不同。

In the political education class, the teacher tells us the difference between necessary products and surplus products.