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。
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。
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。
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。
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。
If he was to have any rest, her husband must once more descend into the garden.
如果他想休息一下，她的丈夫必须再一次溜进花园里去。
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。
FOLLOW THEM as they descend silently.
它们悄悄地向杰克和奈提莉飞去，跟着他们。
From there, the episodes descend into chaos.
从这时起，情节陷入一片混乱。
And he tells him to descend from the mountain.
然后让他下了山。
I didn't expect him to descend to personal abuse.
我没料到他会堕落到对我进行人身攻击的地步。
Lander that flies down with thrusters to help it descend.
为了到达火星表面，NASA设想一种空气动力着陆器，用推进器帮助它下降。
The foothills descend into the subtropical Duars plain.
丘陵地带以下是亚热带的Duars平原。
They also have difficulty with stairs and descend feet-first.
他们上下楼梯也有困难，下楼时，用脚先下楼。
It took us two hours to descend, feebly assisted by the rope.
靠条绳子的帮助，我们花了两个小时下山。
And let me be Your footsteps, That descend from mountains tall.
我愿是您足迹，陪您走下山巅。
How did this land of plenty descend into a perilous free-for-all?
这么一大块土地是如何蜕变成一场危险的混战呢？
Hundreds of big wheels descend on the Swiss ski resort each year.
每年，数百名全世界最有影响力的人物都会聚集在这个瑞士滑雪胜地。
As Charles Baudelaire once said, we descend into hell by tiny steps.
查尔斯·波德莱尔曾说，我们一次一笑小步地堕入地狱。
A sizeable number of Spanish citizens also descend from these communities.
相当多的西班牙国民也是来自这些国家的后裔。
A sizeable number of Spanish citizens also descend from these communities.
相当多的西班牙国民也是来自这些国家的后裔。
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