1.respond to 对…作出反应

Never respond to requests for personal or account information online ( or over the phone).
绝对不要响应那些在线要你提供个人或账户信息的请求（或通过电话的这类请求）。

A spokesman didn't respond to requests for comment.
该公司一位发言人没有回应记者的置评请求。
2.fall back 后退，退却

We must have something to fall back upon.
我们总得有点可以依靠的东西。

The oil price may not rise much further, and could even fall back.
石油价格可能不会持续走高，甚至会出现回落之势。

3.contribute to 促成 ；投稿；有助于

Such actions would contribute to the desired structural transition.
此类举措将有助于实现中国渴望的结构转型。

They also may contribute to preventing severe disease and death.
这些药物还可有助于预防严重疾病和死亡。

4.offer to 提供

A sep is a retirement savings plan that small companies often offer to their employees.
一个sep是一个退休储蓄计划，是小公司经常为员工提供的。

Another significant gap exists between mobile access to e-resources presently offered by libraries and the services libraries wish to offer to mobile users.
另一个显著的断层是现有的移动设备接入电子资源与图书馆希望向移动读者提供的服务之间的差别。