L the backpack supplies pure oxygen for the astronaut to breathe, and gets rid of the carbon dioxide he or she gives out.

背包里有氧气供航天员呼吸，并且可以排除航天员呼出的二氧化碳。

youdao

L Oxygen is circulated around the helmet to stop the visor misting.

头盔内有氧气循环流动，除了供氧，还可以防止面罩雾化。

youdao

Immediate admission orders include oxygen by nasal cannula at 4 L/minute, blood work, a chest radiograph, a 12-lead electrocardiogram (ECG), and a 2 mg of morphine sulfate given intravenously.

鼻导管给氧，每分钟4升；采血；胸透；12导的心电图；2毫克的硫酸吗啡静脉注射。

youdao

So, we can put our sulfur in the middle, and then it doesn't really matter how we draw the rest of it, where we put our c l's versus where we put our oxygen.

那么，我们可以把硫放在中间，然后把其它的原子画在哪里就不重要了，把两个氯原子与一个氧原子放在哪里都行。

麻省理工公开课 - 化学原理课程节选