You can sign up for service only when you need it.

你仅当需要时签约使用服务就行。

youdao

Using this new service only requires knowing its interface and name.

使用这种新的服务只需要知道它的接口和名称。

youdao

You can turn on service only when you’ll be traveling, for example.

你可以打开服务当你出差的时候。

youdao

He was only twenty-seven. Thousands of fans attended his memorial service.

VOA: special.2009.11.06

They had a mail service, although it was for official use only.

建立了邮政系统，虽然只供官方使用。

耶鲁公开课 - 新约课程节选

So if you get the CD set, not only do you get a wonderful beginning library of classical music but in effect you get a lifetime service contract with it.

所以一旦你买了整套CD,你不仅可以拥有一个古典乐图书馆,而且还可以享受终身服务

耶鲁公开课 - 聆听音乐课程节选

The revenues generated go to funding the Postal Service only, not the U.S. government at large.

FORBES: Fanning The Fees

The Welsh Ambulance Service again asked the public to use its service only when necessary.

BBC: Wales snow: Amber 'be prepared' warning of heavy falls

For now, users should stay off of Twitter.com and access the service only through third party applications.

FORBES: Twitter Hit With A Quick-Spreading, Clickless Virus