The Nine Peaks in Songjiang are the only natural hills in Shanghai. Green trees amid the hills and red-roofed houses set off one another, with dense forests covering in the surface of the hills.

松江九峰是上海唯一一处自然山丘，山间绿树红楼掩映，山体表面林木深秀。

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They set off at a jog up one street and down another.

他们跑步出发，沿着一条街跑过来又沿另外一条街跑过去。

《柯林斯英汉双解大词典》

This set off a domino effect, as one part of the grid taxed another.

这一处电力中断引起了多米诺效应，一处电网故障接二连三的把负担施加给另一处。

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Nomads set off in the morning to drop off the kids at school and then spend all day hopping from one third place to another, with stops at the gym, the post office and so on.

ECONOMIST: Nomadism changes buildings, cities and traffic

Hundreds of thousands of Boston-area residents remained shuttered indoors after a wild overnight shootout killed one of the men suspected of bombing the Boston marathon and set off a massive manhunt for another suspect.

FORBES: Boston Still Shuttered As Hunt For Bombing Suspect Continues

One man sued to stay off - yesterday a judge ruled against him in another case set amid the tensions between privacy and public safety.

NPR: Sex Offender Loses Bid to Stay Off Web ID List