In countries like Germany and the U. S., you have to check a box if you want to opt in.

在德国、美国等国家，你要在一个方框内打对勾来选择加入。

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Many of China"s new middle classes will opt to drive in private cars and traffic mayhem is now a regular feature of the holiday period."

许多中国新中产阶级会选择驾车出行，交通混乱也已成为现今节假日期间的正常现象。

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The paper presents OPT' s structure and its benefits.

本文介绍了OPT的结构及其益处。

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True, Mr Blair is to end Mr Major's opt-out from Maastricht's social chapter, which produces common workplace legislation.

ECONOMIST: European Union

Last year, the agency forced online advertising company Chitika Inc. to delete data it had collected from people who tried to opt-out but were unaware that Chitika's opt-out expired after 10 days.

WSJ: Websites Accused of Privacy Violations After Personal Data Reappears

The UK's opt-out from the Working Time Directive only applies to the directive's clause setting a 48-hour limit on the working week.

BBC: EU court: Workers sick on leave can get extra time off