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1·In 1971, shortly after John Lennon arrived in New York on a visa, he began associating with radical anti-war activists, and the FBI put Lennon under surveillance.

1971年，列侬带着美国签证到达纽约，与积极反战人士会面不久后，FBI便开始监视他。

2·Bond markets are nervous: Moody's, a ratings agency, this week put France's AAA rating under surveillance and spreads over German Bunds have widened to 19-year highs.

债券市场也很紧张：评级机构穆迪公司在本周将法国的AAA评级纳入监督之中，并且整个德国国债扩展至19年来的最高点。

3·Under the situation at present, the network model about surveillance, field investigation and treatment were put forward when the severe infectious disease prevailed.

提出了目前情况下，重大传染病流行时，疫情监测、现场调查和现场处理的网络模式。