If there is a critical mass of Android users out there waiting to spend money on apps, developers will jump through hoops to tap that market.
如果Android使用者中有一批挑剔人物等着为应用花钱，开发者们会赴汤蹈火的开发这个市场。
It takes about 2-3 years to master any new critical skill, give yourself at least that much time before you jump ship.
掌握任何新的关键技能都需要大约2 - 3年，在你跳槽前，你至少需要给自己这么长时间。
The water depth after critical hydraulic jump plays an important role in the design of energy dissipators.
自由临界水跃的跃后水深对设计消能防冲工程的安全和经济性起着很重要的作用。
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