If your doctor told you that you need to lift weights, you would start with light weights, gradually working your way up to the heavy ones, thereby increasing your power.

如果你的医生告诉你，你应该举重，你应该从较轻的重量开始，逐渐加重到更重的重量，由此来增加力量。

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However, increasing the velocity at a given spin reduced the lift coefficient.

但是，旋转速度不变的情况下增加球速会降低升力系数。

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That is partly because of increasing vibration, but mainly because the spinning rotor blades provide both lift and propulsion.

直升机旋翼既要提供升力又要提供向前的推力是造成这一情况的主要原因，同时旋翼产生的震动也是一个让直升机飞不能高速飞行的部分原因。

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Some of these product technologies like rod lift are seeing increasing demand due to the changing dynamics of the oil and gas production market.

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Although there have been rampant rumours that American oil firms are continuing to do business with Iran through middlemen and front companies, the firms are putting increasing pressure on Washington to lift the sanctions officially.

ECONOMIST: Iran

That is partly because of increasing vibration, but mainly because the spinning rotor blades provide both lift and propulsion.

ECONOMIST: Chop, chop