海洋中浮游植物的数量在变化。

The quantities of phytoplankton in the ocean are changing.

youdao

“人们忘记了事情总是在变化，”他说。

People forget that things change all the time," he says.

youdao

当然，你必须不断更新你对街道的了解，因为城市在变化。

Of course you have to keep updating your knowledge of the streets, because the city changes.

youdao

So I think there's just a lot of progressive thought in San Francisco, a lot of people pushing for changes.

旧金山有很多进步思想，很多人一直在推动着变化的发生。

进步的旧金山 - SpeakingMax英语口语达人

And it's always going to come down to calculating the appropriate free energy, and how it changes in the process.

这总是涉及到计算,适当的自由能，以及这些自由能在过程中如何变化。

麻省理工公开课 - 热力学与动力学课程节选

So if we have a negative change in energy for any reaction as it's written, what that actually means is we're giving off energy as the reaction proceeds.

如果我们像这里写的这样,在任何一个反应过后，得，到的能量变化为负值,这就意味着我们在这个过程中放出了能量。

麻省理工公开课 - 化学原理课程节选