Why dose a whole field with chemicals if you can spray only where they are needed?

如果你可以只在需要的地方喷洒化学药品，为什么要在整个田地里喷洒呢？

youdao

As if you needed another reason to hate the gym, it now turns out that exercise can exhaust not only your muscles, but also your eyes.

若你需要另一个讨厌健身房的理由，最近事实证明，运动不仅会使肌肉疲劳，还会让眼睛疲劳。

youdao

For example, if you only needed to audit database connection and system administration event types, you would only specify the VALIDATE and SYSADMIN event types when configuring the facility.

例如，如果只需要审计数据库连接和系统管理事件类型，那么在配置审计功能时应该仅指定VALIDATE和SYSADMIN事件类型。

youdao

"We are able to do these transplants locally. We have got the expertise in this country and the only thing that we needed to do is to publicize and tell them, 'Yes,you do not have to spend all the money and go outside there, leave the comfort of your country and the beloved ones to have the transplants outside there - we can do it here."

VOA: standard.2010.05.30

It didn't-- if you needed more time to get some business done you'd have to borrow, but you'd only have to pay 1% a year.

如果你需要更多时间来完成业务,你需要借款,而只需付1%的年利息

耶鲁公开课 - 金融市场课程节选

So, our bodies are capable of making antibodies that are tuned for all the potential antigens that we come into contact with, That's amazing that we have this capacity to respond and you respond only when needed.

所以 我们的身体具有制造抗体的能力,这些抗体对于各种潜在抗原具有特异性,我们具有只在需要时做出,免疫反应的能力 这太让人惊叹了

耶鲁公开课 - 生物医学工程探索课程节选

Not so long ago the only name you really needed to know in central banking was the name of the chairman of the U.S. Federal Reserve.

FORBES: Names You Need To Know in 2011: Axel Weber

You can choose to use more of your data bucket on your tablet, for example, or tap into your databucket only when needed for devices you use occassionally.

ENGADGET: AT&T unveils Mobile Share, lets you add 10 devices to a single plan

All it takes is an evening bundled in the soft terrycloth of your spa robe to realize that the only outlet you really needed can't be found in any wall.

BBC: Daily deal: Virginia horse country inn and spa