1 sentence for 防线 (fáng​xiàn — line of defense)

1. 你是抵御灾难的最后一道防线。

   nǐ shì dǐ​yù zāi​nàn de zuì​hòu yī​dào fáng​xiàn.

   You are the last line of defense against disaster.

   Source: CCMatrix