Carlos knew it would take a lot more work than he had been putting in.

卡洛斯知道这需要比他付出的更多的努力。

Alvarez said in his testimony that despite some positive developments there is still a lot more work to be done.

Alvarez在他的证词中指出，尽管有些许正面的发展，但还需完成许多工作。

Because water is very stable, and splitting it up requires a lot more work than it's worth, kinda like climbing up a steep slide.

因为水非常稳定，把它分离需要做的工作比它的价值要多得多，有点像爬上陡峭的滑梯。

This is why there's been a lot more work done on the second approach, which is turning off sperm production entirely.

这就是为什么更多的研究集中在第二种方式：即直接停止精子的产生。