Sun Mao and another doctor started at the same time.

"I count three numbers and work hard together!" Sun Mao shouted, and another doctor nodded hard.

"One, two, three, pull out!" Sun Mao shouted loudly and both of them tried hard at the same time.

"Thi!" At last, the ventilator was pulled out when the wind broke.

When they were relaxed, they suddenly saw a mouthful of yellow stuff in the respirator, which turned out to be yellow phlegm.

"I depend, even phlegm comes out, what to do!" Another doctor looked at Sun Mao and said.

"Get it out first." Sun Mao was speechless, but he pulled it out unexpectedly....