They allow you to save effort by doing work once instead of repeating it each time you need it.

它们让你通过做一次工作来省力，而不用你每次需要它的时候都重新做一遍。

youdao

Dr. Craven is coming to see you at once, if you'll allow him.

如果您允许的话，克雷文医生马上就来看您。

youdao

Once purchased and trained, this would allow the casual user to save money and time, freeing up precious space in our busy lives to read a good book.

一旦购买并训练好了这样的机器人，临时用户就能节省金钱和时间，从我们的繁忙生活中腾出宝贵的空间来读一本好书。

youdao

Set basic boundaries then allow innovation: Once the parameters are set, allow the team to be creative and achieve goals in the best way they know how.

FORBES: Hiring Great Leaders

But victories, he argues, will allow investors to once again focus on promising experimental medicines, like Gardasil, a vaccine to prevent cervical cancer, and a new diabetes pill.

FORBES: Merck Wins Battle, Faces War

Not much anyone can do since the FCC does allow the Copy Once CCI byte to be set on non-broadcast TV, but still, it sucks for those who are affected.

ENGADGET: FiOS customers moved to Frontier getting Copy Once DRM HD