Only during ovulation does this become thin enough to be penetrated by sperm cells.

A sperm is mostly a nucleus surrounded by little other cellular material.

精子的主要是一个细胞核和围绕该细胞核的少量其他细胞物质构成.

He has a low sperm count (= very few live male cells) .

他的精液精子计数低。

Conception occurs when a single sperm fuses with an egg...

当一个精子和一个卵子结合时受孕就发生了。

...a sperm donor.

精液捐献者

Any disease which undermines a man's general health will interfere with his sperm production...

任何有损男性整体健康状况的疾病都会影响精子的产生。

They can go to a sperm bank and take a chance on unknown genes.

他们可以去精子库,去选择不知名者的精子.

In most cases, donor sperm is obtained from a sperm bank.

大多数情况是捐精来自精子库.

Miranda : Honey, let's go to the sperm bank to search for a suitable sperm donor.

亲爱的, 我们到精子银行找找合适的精子捐赠者吧!

You went to a sperm bank?

你去精子银行?

A sperm whale is to have dived to 2000 metre.

据说一头抹香鲸潜到了2000米.

The sperm whale has about thirty teeth in its lower jaw.

在抹香鲸的下颚上大约有30颗牙齿.

The only enemy of the giant squid seems to be the sperm whale.

巨型乌贼的唯一的敌人似乎是抹香鲸.

The sperm whale does not feed on small fish like other whales.

巨头鲸不象其它鲸一样以小鱼为主食.

A sperm whale has 50 teeth.

抹香鲸有50颗牙齿.

The sperm whale is dangerous.

鲸鱼中抹香鲸最危险.

This is the largest sperm whale in the world.

这是世界上最大的一头巨头鲸.

The sperm whale therefore has to look for the squid using sound waves.

因此巨头鲸就只得利用声波来寻找鱿鱼.

The toothed whale has a large square head with a cavity that contains the so-called spermaceti.

锯齿鲸拥有很大的头颅.在头颅的腔里含有 所谓 的鲸脑油.

Photo Gallery: Whales Sperm whales'heads are filled with a mysterious substance called spermaceti.

鲸鱼图片 美术馆 .巨头鲸(抹香鲸)的头部充满一种神秘的物质叫做鲸脑.

CDU currently is a valuable diagnostic modality in the evaluation of the torsion of spermatic cord.

研究表明,CDU能够发现精索扭转并评价其程度,可帮助临床医师迅速准确地作出诊断.