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.

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。

youdao

The job offering is active for a specified period of time.

招聘在指定时间内处于活动状态。

youdao

Your application for this position is now active for up to one year.

你对该职位的申请现在一年内处于激活状态。

youdao

But it would keep the Confederate armies active for a few more weeks or months.

VOA: special.2009.12.17

There are more steps that have to happen correctly in order for that insulin to become active.

还有几个步骤,必须正确完成这些步骤后,才能生成有活性的胰岛素

耶鲁公开课 - 生物医学工程探索课程节选

Your brain is active as if you were awake, your EEGs are similar to waking, paralyzed except for the eyes, oh, men get erections and you have dreams.

大脑处于活跃状态，像清醒时一样，脑电图也和清醒时相似，但除了眼部，全身都不会动，男人会勃起，梦境会出现。

耶鲁公开课 - 心理学导论课程节选

Hairs that fall to the ground can be active for up to five years.

BBC: Pangbourne plan to eradicate oak processionary moth

Individual wells can be active for decades, slowly pulling (or stripping) more oil and gas out of the ground.

CNN: Stripper wells try to get more oil from ground

In September, I visited China, where my organization, the Natural Resources Defense Council, has been active for nearly 15 years.

CNN: Obama's China trip is high-stakes mission for environment