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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。
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
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.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
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。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
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。
Supporters of the death penalty argue that it would deter criminals from carrying guns...
死刑的支持者认为它能阻吓罪犯携带枪支。
相关例句
This cartoon not only fits children's taste, but also educates them.
这个卡通片不仅童趣盎然, 而且很有教育意义.
to muffle yourself up in cold weather
冷天用厚衣服裹着自己
Stop making me cry in the street; I hate making an exhibition of myself.
别弄得我在街上哭, 我讨厌当众出丑。
All apples on apple trees are downward.
苹果树上的所有苹果都是向下的。
...dry, academic phrases.
枯燥无味的学术词汇
glancing curiously about him
好奇地扫了他一眼
It is thus held that the eolian Nd input isnegligible to the oceanic Nd budget.
因此,笔者认为风成粉尘对太平洋深水中溶解的Nd总量的影响可以忽略不计.
The English word " television " is a mongrel because " tele " comes from Greek and " vision " from Latin.
英语 television 是个语源混杂的词,因为 tele 来自希腊文,vision来自拉丁文.
I tend to stick to fresh fruit for pudding.
我一直坚持用新鲜水果做甜点。
The Moselle winds through some 160 miles of tranquil countryside...
摩泽尔河在宁静的乡间蜿蜒穿行约160英里。