这些地幔柱显然起源于很深的地方，可能深至地核和地幔之间的边界，而且许多都已经活跃了很长时间。

The plumes apparently originate at great depths, perhaps as deep as the boundary between the core and the mantle, and many have been active for a very long time.

youdao

市场总是到春天就活跃了。

The market always picks up in spring.

youdao

这个女孩过去很害羞，但现在在小组活动中逐渐活跃了起来。

The girl used to be shy, but is gradually getting active in group work now.

youdao

And its opposition seems to me to be all together noble for know well men of Athens if I had long ago attempted to be politically active I would long ago have perished and I would benefited neither you nor myself. Now do not be vexed with me when I speak the truth.

而这样的违背在我看起来很高尚,因为可以彻底了解雅典人,如果很早之前,就试图活跃于政治的话,我早就没命了,也就无法造福你们或我自己,不要因为我说出真相而恼火。

耶鲁公开课 - 政治哲学导论课程节选