2 sentences

1. 你第一道防线就是你的思想。

   nǐ dì​yī dào fáng​xiàn jiù​shì nǐ de sī​xiǎng.

   The first line of defense is your mind.

   Source: CCMatrix

2. 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