The plan doesn't put a limit on emissions or require plants to reduce them by a certain year.

新规并没有限定排放的限额，也没有明确要求工厂必须在一定年限内降低多少排放量。

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Many animals breed only at certain times of the year.

很多动物只在一年的某个时候交配繁殖。

《牛津词典》

Workers at Mexican Oil Company will receive a health incentive of almost $300 a year if they meet certain body weight standards.

墨西哥石油公司的工人如果达到一定的体重标准，一年将获得近300美元的健康奖励。

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Each year it's dramatized by the cycle of the seasons, And at a certain time of the year it seems that The forces of darkness and chaos are prevailing but each spring, Once again, cosmic order and life return.

每年这冲突都由季节的轮回戏剧性地体现出来，仿佛是每年都有一个时期,弥散着黑暗和混乱的势力，可是每当春天来临，宇庙的秩序又恢复了。

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The Evening Star is the, roughly speaking, first heavenly body that's visible in the sky as it gets dark, at least at certain times of the year.

粗略说来,昏星就是,天黑时第一个能看见的天体,至少在一年的某个时间段是这样

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On this one day certain each year, the future best of a profession in the world are starting their journey.

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At the least, tinkering of some kind is certain next year.

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Can you be certain that Year 3 will be positive?

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