The mayor had become ineffectual in the struggle to clamp down on drugs.

该市长在打击毒品的斗争中行动不力。

《柯林斯英汉双解大词典》

Some countries have changed their rules to clamp down on this, others have not.

一些国家已经改变他们的法规来取缔这种行为，而其它国家尚未这么做。

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Montenegrin officials say these are Serbian slurs and insist they are doing all they can to clamp down on organised crime.

黑山官员说，这些都是塞尔维亚的诋毁之词，并坚称他们正尽全力严加控制有组织的犯罪活动。

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Under a private system, the link between price deviation and correction is immediate and strong because supply is under the direct control of the currency issuers, who have the means through loan and trading operations to tightly clamp down on (or expand) the supply.

FORBES: Private Currency Competition Is The Monetary Answer

The National Landlords Association (NLA) welcomed the Slough scheme as an effort to clamp down on rogue landlords.

BBC: Slough landlords checked for energy ratings certificates

Spurred by rising fiscal deficits, the United States and other members of the Organization for Economic Cooperation and Development (OECD), particularly Germany and France, have been using a variety of methods to clamp down on tax cheats, tax havens and overseas financial centers.

FORBES