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。
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。
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'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。
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。
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。
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。
"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？”
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？
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。
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。
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。
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。
Either you descend into flowery metaphor or you indulge in the "naming of parts".
你或者浸淫在华丽的比喻里，或者沉迷于“玩意儿的名字”中。
"I can't let you do that," she says, envisioning, no doubt, the chaos that would descend in a matter of days.
“我不能让你做”她说，脑海中浮现出如果这么干，几天之内毫无疑问会降临的种种混乱。
If he allows me to descend into madness... could it somehow be a sign of his love?
如果他让我坠入疯狂的深渊……有没有可能这是一种爱的象征呢？
These lions are especially vulnerable to disease because they descend from as few as a dozen individuals.
这些狮子特别容易感染疾病，因为它们都是从那仅有的十来只狮子遗传下来的。
The lovers attract the attentions of a rapacious gang, who descend on them, searching for non-existent booty.
这对爱人引起了贪婪的刚的注意，为了寻找并不存在的宝藏他袭击了他们。
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。
Project models: This layer contains models that descend from the enterprise models and contain transient differences.
项目模型：该层包含了源自企业模型的模型，并含有暂时性的差异。
From there, the episodes descend into chaos.
从这时起，情节陷入一片混乱。
Amble from your canopied bed to your own private pool or descend a ladder directly to the sea.
从你被天蓬遮盖的床边缓慢走向你专属的私人泳池或者顺着阶梯直接通向大海。
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。
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。
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。
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