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The earth's magnetosphere is at once protective and dangerous.是什么意思？

The earth's magnetosphere is at once protective and dangerous.

地球的磁层既具有保护的功能，却又极其危险。

相关词汇
the magnetosphere is at once protective and dangerous

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；
例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

magnetosphere

n. 磁气圈，磁层；
例句
The earth's magnetosphere is at once protective and dangerous.
地球的磁层既具有保护的功能，却又极其危险。

is

vt.& vi. 是（be的三单形式；n. 存在；
例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

at

prep. （表示位置）在，在（某时间或时刻），以，达， 向，朝；n. 阿特（老挝辅币单位，100 阿特 = 1 基普）；
例句
Prices start at £13.95 a metre for printed cotton...
印花棉布以每米13.95英镑的价格起售。

once

adv. 一次，一趟，一倍，曾经，一旦；conj. 一旦…就…，一经；n. 一次，一回；
例句
The Hell's Angels were once the most notorious and anarchistic of motorbike gangs.
“地狱天使”曾是飞车党中最臭名昭著和无法无天的一伙。

protective

adj. 保护的，防护的，保护贸易的；
例句
The arrogance became his protective carapace.
这种傲慢态度成了他的保护壳。

and

conj. 和，与，而且，于是，然后，因此；
例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

dangerous

adj. 危险的；
例句
He's taking a dangerous drug: it acts very fast on the central nervous system...
他正在服用一种危险的药物：这种药物能很快影响到中枢神经系统。
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他当众承认自己可能犯了个错误。
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使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
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详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
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一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
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追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
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雕刻家伯恩特·诺特克的作品
She speaks a little French.
她会讲一点法语。
They stuck to their task manfully.
他们恪尽职守。
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尽管他已经40岁了,但还是独身。
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熄灯后禁止交谈。
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丹所有的感官都燃烧着激情。
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