This break in Earth's history is marked by a mass extinction, when as many as half the species on the planet became extinct.

地球历史上的这次重大灾难以物种的大量消亡为标志；当时，地球上多达一半的物种都灭绝了。

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One time I saw a young man rushing around, his mind obviously occupied by a mass of projects and ideas.

有一次我看到一位年轻人忙得团团转，显然心中有一大堆计划和点子。

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The vote on September 24th, a by-election for 18 seats in the 40-seat parliament vacated by a mass resignation of opposition MPs, was widely boycotted.

于9月24日举行的、由反对派议员集体辞职而空缺的18个席位（议会共40席位）的递补选举遭到了大范围的联合抵制。

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"I offer Catholic Mass,' cause I'm a Catholic priest by profession,and so it is actually the feast day of Mary,Mother of God.

VOA: special.2009.12.28

We know now with the same spring, by this comparison, we will find all objects now can be attributed a mass.

我们现在知道利用相同的弹簧,采用这种比较的方法,就会发现,所有物体都有确定的质量

耶鲁公开课 - 基础物理课程节选

Now I can measure that, because I pull it by one centimeter and I find the acceleration it exerts on a known mass.

现在就能测量这个力了,因为把弹簧拉伸 1 厘米,我就知道它让一个质量已知的物体产生的加速度

耶鲁公开课 - 基础物理课程节选

The opening ceremony was being followed by a mass synchronized Victorian PE drill for all participants.

BBC: The Shropshire Olympian Festival recreates 1864 event

Using the handle Flashboy, Ternovskiy soon mastered the art of the denial-of-service attack, wherein a target system is paralyzed by a mass of incoming communication requests.

NEWYORKER: Roulette Russian

To his critics, he is a publicity-seeker who has endangered lives by putting a mass of sensitive information into the public domain.

BBC: Profile: Wikileaks founder Julian Assange