In order to make a nuclear explosion, the critical mass must come together within a fraction of a millionth of a second.

为促成一次核爆炸，临界质量必须在一百万分之一秒内聚集在一起。

《柯林斯英汉双解大词典》

Another newspaper article: DELIRIUM TREMENS TWAIN—Mark Twain, who was to make a speech at the mass meeting of the Independents last night, didn't come to time!

报纸上又有一篇文章说：“患震颤性谵妄的吐温，昨晚本打算在独立派群众大会上发表讲话，却没来！”

youdao

In order to make the complex affordable, Safdie devised a plan for on-site mass production of the concrete blocks.

为了使这一建筑人人买的起，Safdie为进行现场大规模生产混凝土制定了一套计划。

youdao

Newton says F = ma, so to make it a useful result of this problem, we know the mass of this guy.

牛顿指出 F = ma,这对于解决这个问题很有用,我们知道这个物体的质量

耶鲁公开课 - 基础物理课程节选

L.U. does, but they realize that the only way to turn the Internet into a genuine mass medium and make a real pile of money is to convince the public that it is a clean and well-lighted place.

CNN: Why Johnny Can't Surf

To do so, he would have to intervene personally and make a number of burdensome findings in order to overrule a determination of mass market or foreign availability made by his Secretary of Commerce.

CENTERFORSECURITYPOLICY: The High-Tech for China�� Bill

The challenge now is to turn this cyclical bounce into a more sustained upswing above all, one that can make a big dent in Europe's mass of unemployment.

ECONOMIST: The euro economy