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》

Only in this way can the critical mass of participation be reached.

只有这样才能凑足参加人数。

《柯林斯英汉双解大词典》

You need to develop the critical mass of services that enable your line of business, enterprise, or ecosystem.

您需要开发服务的关键部分来支持您的业务部门、企业或者生态系统。

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SEIPI, the Philippines' electronics-industry association, the country retains a critical mass in the chip-making business.

ECONOMIST: Relocating factories to China is not always a good idea

Gregory Jette, an analyst at Jefferies in Paris, said Friday the company lacked mid-term prospects and the critical mass, possessed by the large players of the industry such as L'Oreal, to achieve substantial growth.

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On most Wednesday nights for the last seven years, hundreds of cyclists have joined in the Ciclopaseo ride, a Critical Mass-style pedal through the city streets that is about the fun of riding and also stands as a political message about cycling rights in the city.

BBC: Reclaiming the streets in Bogota