That is why many researchers are working on ways of reducing the number of animal experiments needed and of making those that still happen more effective.

这也是为什么许多科研人员一直在致力于发现一些有效方法来减少动物实验的数量并让现行的实验更具科研效果。

youdao

Include ones you already possess and those you're still working on.

包含那些已实现的和仍在争取中的。

youdao

My student loans? Well, I'm still working on those.

我的助学贷款？呃，我还在还。

youdao

Those still working received less pay.

VOA: special.2010.06.24

Tens of millions of those still working either do so for governments or depend on public contracts.

FORBES: Cut Spending By Returning To Founding Principles Of Federalism

Of those still working, nearly half want to retire by age 65 and about another quarter envision retiring between 66 and 70.

MSN: Poll reveals baby boomers' retirement fears

Those still working in Iraq have only a partial picture.

ECONOMIST: Relief agencies face a daunting task