And he measures comfort in part based on the pressure drop of air entering the mask—basically, how hard it is to breathe.

他对舒适度的测量部分基于空气进入口罩的压降——也就是戴口罩时呼吸的难易程度。

However, the increased amount of air entering the engine caused the bypass ratio to expand so much that it made any drawbacks negligible.

然而，进入发动机的空气量增加导致涵道比扩大得如此之多，以至于任何缺点都可以忽略不计。

It already made sense to try to stop pollutants like soot and ozone from entering the air in the first place and to cut back on the emissions of greenhouse gases like carbon dioxide and methane.

尝试在源头地区阻止像煤烟以及臭氧等污染物进入空气以及阻断像二氧化碳，甲烷等温室气体的排放这些措施都是具有实际意义的。