每个手术都存在一定的风险。

Měi gè shǒushù dōu cúnzài yídìng de fēngxiǎn.

Every surgery carries a certain amount of risk.

每次有他存在的时候，我都会感到有压力。

Měi cì yǒu tā cúnzài de shíhou, wǒ dōu huì gǎndào yǒu yālì.

Whenever he’s around, I feel pressured.

我们检查过了，你所说的问题并不存在。

Wǒmen jiǎnchá guo le, nǐ suǒ shuō de wèntí bìng bù cúnzài.

We’ve checked, and the problem you mentioned doesn’t exist.