There are some 2, 000 species of seastars living in the world’s oceans, and many wear striking colorsthat provide camouflage or warn off predators.

世界各地的海洋中有约2000种海星。 其中许多都披着眩目的色彩，为自己提供保护或警示捕食者。

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When a territorial animal or bird intrudes on the territory of another creature of the same species, the latter will only perform some hostile gestures to warn off the intruder.

当地盘性的动物或鸟类侵入别的同类动物的领地时，后者只会做一些表示敌意的姿态以吓跑入侵者。

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The police officer pressed two passersby into service to warn off traffic.

警察临时将两名路人找来协助指挥交通。

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Monday afternoon, Thai soldiers fired shots in the air to warn off protesters throwing stones, boards and water bottles at firefighters.

VOA: standard.2009.04.13

As Yemen battles al-Qaida in the Arabian Peninsula, a Southern separatist movement, and tries to wrap up a six-year old war in the north, Western governments warn their citizens to stay out of the country, scaring off tourists and investors.

VOA: standard.2010.04.20

In fact, we heard today that another moderate cleric, a very senior moderate cleric in the southern city of Kandahar was gunned down, and this is apparently part of a tactic that's intended to warn people off from cooperating with the government of President Hamid Karzai, warn people off from cooperating with the United States and NATO troops who are here.

NPR: Roadside Bomb Kills Four Soldiers in Afghanistan

This is not the only initiative on the menu to warn consumers off certain foods.

ECONOMIST: Junk food

Key recommendations in Defra's report include a legal requirement for vessels to use "pingers", a device which will emit a noise under water to warn dolphins off.

BBC: Dolphins plan dismissed