2 sentences

1. 你别小看这门生意，里面的道深着呢。

   nǐ bié xiǎo​kàn zhè mén shēng​yi, lǐ​miàn de dào shēn zhe ne.

   Don't underestimate this business; there is a lot of depth to it.

   Source: Dong Chinese Dictionary

2. 我们绝对不能小看这次比赛的难度。

   wǒ​men jué​duì bù néng xiǎo​kàn zhèi cì bǐ​sài de nán​dù.

   We must not underestimate the difficulty of this competition.

   Source: Dong Chinese Dictionary