The two impellers are arranged at the lower end of the axle sleeve to ensure moderate air-draft amount.

两片叶轮装在轴套下端，确保引风量适中。

youdao

This is because the tremendous heat produced from a nuclear blast causes an up-draft of air that forms the familiar mushroom cloud.

这是因为核爆产生的大量的热能会把空气往上吸入，形成令人熟知的蘑菇云状。

youdao

Now, when you look at this there is something quite remarkable and the remarkable thing x - throughout this whole trajectory-- if there is no air draft, - if there is no friction-- is not changing.

你们可以看到,有件事非常值得注意,可以注意到,方向的速度，is，that，the，velocity，in，the，x，direction,在整个轨迹当中-,如果没有空气阻力，也没有摩擦力-,是不会改变的。

youdao

An additional restriction is that vessels must have less than a 190-foot air draft.

FORBES: The Port of New York and New Jersey, a Critical Hub of Global Commerce

Instead, the air force issued a new draft Request for Proposals (RFP) last September that in effect nullified the KC-45's advantages that it can deliver more fuel to front-line aircraft and evacuate more troops.

ECONOMIST: Protectionism and defence procurement