Crack climbing is hell on your ankles and painful on your feet, so focus on speed and continuous movement; stalling in an uncomfortable position is the worst.
爬裂缝就是会毁脚腕而且脚会很疼，所以要保持速度注意动作的连贯性；在一个别扭的姿势上拖延是最不可取的。
By flexing the wings at higher speed, the wings move to create smaller slot gaps and this leads to the wings stalling.
他们发现，通过可变尾翼，在高速状态下，尾翼上的缝隙变小，使尾翼失速。
The results show that stalling torque increases and no load speed decreases with the increase of the pre-load and degree of vacuum.
结果表明，随着预紧力和真空度的增加，马达的堵转力矩增加而空载转速下降；
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