To make sure the spectacle went smoothly, the public security forces clamped down.

为了确保奥运会的顺利举办，公共安全的压力陡然增加。

youdao

But now the clouds clamped down and a sharp scent of sulfur and putrid fish wafted on a dank puff of air.

这时天空突然阴云密布，刺鼻的硫磺味和死鱼的腐臭味随风而来。

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Beijing has clamped down hard on the property market, fearing excessive price rises could fuel social unrest.

北京方面已出台遏制楼市的强有力政策，担心过分的价格上涨可能滋生社会不安定。

youdao

who are increasingly trying to seize the lead. The Intelligence Ministry has clamped down on both the Internet and on mobile phone communications during opposition demonstrations to disrupt communications.

VOA: standard.2009.11.14

While Americans have clamped down on high-end lodging expenses, indulgence in luxury air travel is rising.

FORBES: Luxury Travel Spending Up Despite Gloomy Economy

In the past year though, the authorities seem to have clamped down on it successfully.

BBC: NEWS | Business | New rules to stop carousel fraud

Slow to raise interest rates, China's authorities have clamped down on investment by more direct means.

ECONOMIST: Ah, there's the brake pedal