There are mainly three features in our virtual laboratory of the numerical circuit.

我们设计实现的数字电路虚拟实验室主要有三个特点。

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There are mainly three different reasons for college students to take work-study program.

主要有三种不同的原因大学生勤工俭学。

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There are mainly three steps in pupil detection and tracking: face detection, pupil detection and pupil tracking.

瞳孔检测与跟踪可分为三个阶段：人脸检测、瞳孔检测、瞳孔跟踪。

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Research published mainly in nineteen seventy-three had found proteins on the surfaces of nerve cells in the brain.

VOA: special.2010.05.04

In nineteen eighty-three, the project was turned into an independent bank owned mainly by its borrowers.

VOA: special.2010.06.16

Thus, the U.S. has sought to organize its nuclear forces so that no enemy can launch a disarming first strike, mainly by fielding three distinctly different types of weapons: manned bombers, land-based intercontinental ballistic missiles in hardened silos, and sea-based intercontinental ballistic missiles on stealthy Trident submarines.

FORBES: Nuclear Weapons: How Few Is Too Few?

"In many, many different ways the facility has become a little too small, mainly compared to the other three grand slams, " he said.

CNN: Roland Garros suffers uncertain future

Delivery times have gone from an average of three hours -- and from highs of several days -- to an average of three minutes, mainly because the new system, unlike the old one, was set up so that messages only travel as far as they need to in order to reach their recipients.

CNN: Lockheed finally finds e-mail success