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蚯蚓数量下降70%.用英语怎么说？

蚯蚓数量下降70%.

The earthworm population had declined by 70 %.

相关词汇
the earthworm population had declined by

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。

earthworm

n. 蚯蚓；
例句
An earthworm is a terricolous organism.
蚯蚓是陆生的生物.

population

n. 人口，全体居民，特定[生物]种群，[物]布居；
例句
60 years ago half the French population still lived in rural areas.
60年前有一半法国人仍然生活在乡村地区。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；
例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

declined

v. 辞谢，谢绝（邀请等）( decline的过去式和过去分词 )，（道路、物体等）下倾，（太阳）落下，（在品格、价值上）降低；
例句
The President declined to deliver the speech himself, on account of a sore throat...
总统因嗓子不适而婉拒了亲自讲话。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；
例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品
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。
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。
Nothing to be got without pains but poverty.
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。
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。
相关例句
He swiped me across the shoulder with the poker.
他用拨火棍打我的肩膀。
He fell sick with flu.
他得了流感。
Convoy escorts are only buildable if you have the initial ASW technology.
如果你有初级ASW科技,才能够护航舰.
She knelt and brushed her lips softly across Michael's cheek.
她跪了下来，轻吻迈克尔的脸颊。
Her specialty is taxation law.
她的专长是税法。
To superimpose this life I was born into and grow out of.
我在生长出去;叠映的生活不能叠加其上.
We are not in this to reap immense financial rewards.
我们从事这一行不是为了获得巨大的经济回报。
This was a good decision inasmuch as it worked for you.
既然对你起作用，这就是个明智的决定。
Again and again to leave and escape will only cheapen yourself.
一次次的离开和逃避只会让自己变得廉价.
People were up in arms against the invaders.
人民拿起武器反抗侵略者。