tightens
v.
收紧( tighten的第三人称单数 );
（使）变紧;
（使）绷紧;
加紧;
例句:
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One set of provisions tightens emission standards.
一套使排放标准更加严格的规定.
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Requires no special tools or fittings; hand tightens to relief valve outlet.
不需要专用工具或管件; 用手将其紧固到安全阀上即可.
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The heart tightens at the grandeur we've already left behind.
在我们已经抛到身后的雄伟里,心在收紧.
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UN Security Council tightens economic and trade sanctions on Tehran.
来自BBC
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Historically, the Kremlin tightens media and societal controls before elections.
来自VOA
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It also tightens scrutiny on transfers of bulk cash and further restricts travel.
来自VOA