1 sentence

1. 免疫反应就像一场武装斗争：敌人渗透，身体自我防卫。

   miǎn​yì​fǎn​yìng jiù xiàng yī chǎng wǔ​zhuāng​dòu​zhēng: dí​rén shèn​tòu, shēn​tǐ zì​wǒ​fáng​wèi.

   The immune response is like an armed struggle: an enemy infiltrates and the body defends itself.

   Source: CCMatrix