The pilots were told to descend to 2-2,000 feet.
飞行员被告知要将飞机下降到2-2000英尺。
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。
With a thin scream, like a tea-kettle whistle, the medusa starts to descend.
随着一声像茶壶煮开了水那样的微弱的叫声，水母开始下降。
It would need to deploy a parachute, descend through the clouds and transmit a GPS coordinate to a cell phone tower.
它需要打开降落伞穿过云层下降，把GPS坐标发射到手机基站。
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。
飞机开始降落。
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。
Things are cooler and more damp as we descend to the cellar.
我们往地窖中下得越深，里面就越冷、越潮湿。
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。
Some 3,000 city officials will descend on Capitol Hill on Tuesday to lobby for more money.
大约三千名市政官员将于周二突访美国国会山，为争取更多经费游说。
We didn't descend the mountain until noontime.
直到中午我们才下山。
Whether they are a peculiar sister group, or the ur-snake from which all others descend?
它们究竟是一种特殊的分支种群，还是其他各种蛇类的鼻祖？
"How can you dare," said she with angry look, "descend into my garden and steal my rampion like a thief?"
“你怎么敢，“她怒气冲冲地说，“溜进我的花园，像个贼一样偷我的莴苣？”
This morning I simply dived into deep water off the rocks nearest to the house, where they descend almost sheer.
今天早上我只是在最靠近房子的礁石深水处潜水，那里的岩石几乎是陡峭的。
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。
A wild duck (Anas platyrhynchos) of which the male has a green head and neck. Most domestic ducks descend from the mallard.
一种野鸭（绿头鸭），其雄鸟具有绿色的头和颈。大部分驯化了的家鸭都是绿头鸭的后裔。
I never descend to such meanness.
我决不干这种卑鄙的事情。
She would never descend to baseness.
她永远不会堕落到卑劣地步。
Blessed silence and relief descend.
神圣的静寂和宽慰慢慢沉落。
With a great cry, the stone clubs descend.
伴随着一声大叫，石锤应声落下。
With a great cry, the stone clubs descend.
伴随着一声大叫，石锤应声落下。
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