The blades have an aerofoil shape and provide lift when passing through air, like the wings of an aeroplane.

这些叶片拥有机翼的剖面形状，它们就像普通飞机的机翼那样，通过划过空气来产生升力。

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Indeed, it is possible that the effect works both ways, and that rearward segments provide lift to those in front.

事实上，反过来也可能产生这种效果，即后半部分可为前半部分起到提升作用。

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Flying fish rely on a similar flow of accelerated air from their pectoral fins to provide lift to their smaller pelvic fins.

同样，飞鱼借助胸鳍所产生的加速气流，就可以对较小的腹鳍产生一定的提升作用。

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Unfortunately, because they lack fixed wings to help provide lift, they are also expensive to operate.

ECONOMIST: Monitor

Consequently, the rise in stock prices should provide some lift to spending, Emmons said.

NPR: Average US Household Far From Regaining Its Wealth

Any upgrades from this bunch of holdouts could provide addition lift for the security.

FORBES: Magazine Article