This sentence is in the active voice.

How many kids in this school are sexually active?

这个学校有多少年轻学生性行为活跃？

The active suspension system gives the car a very smooth ride.

这个主动悬架系统使汽车行驶起来非常平稳。

He was to remain active in the association, latterly as vice president, for the rest of his life.

他此后一生都活跃于协会中，后来还当上了副会长。

By the time I get home, I'm too tired to do anything active.

我到家时累得无法动弹。

The active ingredient in some of the mouthwashes was simply detergent.

某些漱口剂中的有效成分只不过是洗涤剂而已。

In many societies young men regard themselves as highly active, the agents of change, shapers of the world.

在许多社会中，年轻人将自己看成是高度活跃的分子，是变革的推动者和世界的塑造者。

He was very active in Freemasonry.

他是共济会中非常活跃的分子。

Etna is Europe's most active volcano.

埃特纳山是欧洲最活跃的火山。

He was an active bisexual.

他是活跃的双性恋者。

His daughter was very active and noisy in the mornings.

他的女儿一到上午就很好动，吵吵闹闹的。

He is active on Tyler's behalf.

他为泰勒积极奔忙。

An active volcano may erupt at any time.

活火山会随时喷发。

She is still very active, in spite of her advancing years.

她尽管年事渐高，仍然十分活跃。

troops on active service

现役部队

Please email us to be removed from our active list of blood donors.

假如你想把自己的名字从献血联系人名单中删去，请给我们发电子邮件。

He was brought before the tribunal for trial.

他被送到法庭受审.

You walk before and I will follow after.

你在前面走,我将在后面跟着.

Before trying to tackle his homework he read up the notes he had taken at the lecture.

他把课堂上记的笔记认真看过后才动手做作业.

She had no head for business, and it was not long before she went under.

她没有做生意的头脑, 不久就失败了.

Shall we clear up before we go out?

我们是不是在出去前把东西收拾好?