This is my report: One of the major problems in the Biramichi river is that the level of oxygen in the water is too low.

这是我的报告：比拉密契河的主要问题之一是水中的氧气含量太低。

youdao

The degree of quenching correlates to the level of oxygen pressure.

淬灭度与氧压力水平相关联。

youdao

The level of oxygen is very high in water, and you will not have any breathing problems.

水中的含氧量很高，所以你不会有任何呼吸方面的问题。

youdao

Far below sea level, they contain some of the harshest environments on Earth, with no oxygen and no light.

VOA: special.2010.11.10

The respiratory system plays an important role in maintaining our internal environment at the proper level of oxygen, by bringing the right amount in.

呼吸系统的重要性在于,通过向体内输入适量的氧气,维持人体内环境中的氧平衡

耶鲁公开课 - 生物医学工程探索课程节选

By Sunday, she had improved significantly to 33% -- just 12 percentage points shy of 21%, the level of oxygen in air around us.

CNN: STORY HIGHLIGHTS

As the oxygen level fell, though, something else rose: the level of urea.

ECONOMIST: Softshell turtles urinate through their mouths

Inside the lodges, trekkers rest up ahead of their final climb, conserving their strength and yet still burning energy just trying to breathe and function at such an altitude -- at 4, 800m, oxygen levels are only about 55% of those at sea level.

BBC: Nepal��s other Everest