In fact, it has a big role in making sperm.

X染色体在精子的形成过程中起重要作用。

Unlike males who are constantly producing new sperm, females have a finite number of eggs.

与不断产生新精子的男性不同，女性的卵子数量有限。

Their speed goes from eighteen point three micrometers per second up to a whopping thirty point one.

精子的速度从每秒18.3微米上升到30.1微米。

More recent studies have startedfiguring out what kind of chemical attracts a sperm.

很多近代的研究已经开始弄清楚吸引精子的是那物质。

Sperm contain approximately 50 to 75 mitochondria in the tail, to help them swim.

精子的尾部大约含有 50 至 75 个线粒体，来帮助他们游动。

In the epididymis, the tube in which mature sperm are stored, it is a fifth of the usual level.

在储存成熟精子的附睾管中，碳酸氢盐的浓度是通常水平的五分之一。

Are you still mad about the sperm bank? No.

你还在为精子银行的事生气吗？没有？没有。

The most effective spermattractor is called bourgeonal.

最有效的精子吸引子叫bourgeonal。

I asked Allan to walk me through the process of how sperm are actually made.

我让艾伦带我了解精子的实际制造过程。

The most studied approach has been to use hormones to suppress sperm production.

研究最多的方法是使用激素来抑制精子的产生。

Now, male insects do compete with weapons, like the horns on these beetles.

能把雌虫之前与之交配的 雄虫的精子都刮掉。

He said that Tam was likely too old to produce good sperm.

他说，塔姆可能年纪太大了，无法提供优良的精子。

Well, it turns out that self-love can actually improve the quality of sperm.

嗯，事实证明，自爱其实可以提高精子的质量。

And then we look at sperm size and shape - that's called sperm morphology.

然后我们观察精子的大小和形状——这称为精子形态。

Then when the boy grows up, he will have, we've shown, a lower sperm count.

我们已经证明，当男孩长大后，他的精子数量会更少。

After a man dies, his sperm remains alive for some time.

当一个男人死了以后，他的精子仍可存活一段时间。

Then there are children born as a result of sperm or egg donation.

有些家庭的孩子是精子或卵子捐献的结果。

Are there any other aspects of lifestyle that we know do affect sperm production?

我们知道生活方式是否有任何其他方面会影响精子的产生？

And this suggests that there was some intermediate amount of competition for the capacity to create sperm.

这表明，对于产生精子的能力存在一定程度的竞争。

British scientists said they produced healthy baby mice by fusing sperm with reprogrammed cell material.

英国家曾称，他们通过将精子与改组的细胞物质结合，培育出了健康的幼鼠。