The costs change rapidly.

成本变化快。

youdao

We know we are moving into a period where the jobs in demand will change rapidly, as will the requirements of the jobs that remain.

我们知道，我们正在进入一个抢手工作将迅速变化的时期，但对工作的要求仍然保持不变。

youdao

But moods can change rapidly.

但情绪往往变化无常。

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While the Internet's use of language might change rapidly over the next few years, Johnson,Crystal and Jansen all point out that educators need to ensure that students maintain an academic understanding of the use and rules of language.

VOA: standard.2010.01.16

Not only does technology change rapidly, but his political masters make up their minds slowly.

ECONOMIST: Telkom, the state telecoms monopoly, still has much to do

But while disruptive technologies often start out looking dramatically inferior to incumbent technologies, this tends to change rapidly.

FORBES: Disruptive Blogging

At some point, the political environment could change rapidly, and what was once an impossibility becomes easy, even expected.

FORBES: Thoughts On The Recently Completed Debt-Ceiling Agreement