When the water level was high, the user needed only to descend a few steps to reach it; when it was low, several levels would have to be negotiated.(当水位高的时候，使用者只需要往下走几个台阶就能到达井的部位；当水位低的时候，就要走好几层了。)
The pilots did descend to the wrong altitude then, thinking they were following the air controllers' instructions.(飞行员确实以错误的高度下降，并以为他们遵循了空中管制员的指示。)
From there, the episodes descend into chaos.(从这时起，情节陷入一片混乱。)
You can be forced to descend along the cliff edge.(你只能被迫沿着悬崖边行走。)
As you descend, suddenly you see at last the hidden waterfall.(你往下走，最终会突然发现那个隐秘的瀑布。)
The instruction actually meant 22,000 feet, but they thought they heard descend 2,000 feet.(指令实际上指的是22000英尺，但他们以为他们听到的是下降2000英尺。)
Planes must zigzag from one ground beacon to the next, and ascend and descend in steps at each stage obtaining permission from the ground.(飞机从一个地面信标到下一个信标曲折飞行，在每一阶段都要经过地面的许可才能上升和下降。)
It expels gas to descend, and expels water from trim bladders to rise.(它通过排出气体来下降，并通过把水排出气囊来上升。)
Blessed silence and relief descend.(神圣的静寂和宽慰慢慢沉落。)
We're not going to descend to such methods.(我们不会堕落到使用这些方式的份上。)
