If you want to be active when you are on vacation, then try an active vacation.

如果你想在度假时活跃起来，那就尝试一个活跃的假期。

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The nutrients are deep down in the active layer anyway, not high up near the surface, which is the part of the active layer most affected by run-off.

不管怎样，营养物质存在于活性层深处而不是在表层附近，活性层受径流影响最大的地方。

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From the small number of impact craters that appear on Martian lava flows, one can estimate that the planet was volcanically active as recently as a half-billion years ago—and may be active today.

从火星熔岩流上出现的少量陨石坑中，我们可以估计，在5亿年前，这个星球上的火山还很活跃——也许现在依然活跃。

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Women who said they were physically active even once a week showed less cognitive impairment as measured by a test.

VOA: special.2010.07.07

I'd like to describe what we're doing in both of those aspects, both of technology and active learning aspects.

我想谈谈我们在这两方面,具体干了什么，在技术和自主学习两方面。

麻省理工公开课 - 媒体、教育、市场课程节选

It's also known for students who are very passionate and active in a lot of different activities.

布朗大学的学生也十分热情，他们会积极参与各种活动。

被学问的自由所迷住 - SpeakingMax英语口语达人

It is important to maintain an active routine, to keep physically fit and mentally active.

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Parents who are physically active will likely have kids that are physically active as well.

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Instead of 20 active divisions, the Army would consist of 12 active and eight reserve divisions.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2