It cited statistics from the student and Exchange Visitor Program, a Department of Homeland Security unit that tracks foreigners in the US on student visas and the schools they attend.
数据援引自国土安全部中负责中学生和交流访问者项目的一个部门，这个项目跟踪外国人在美国的学生签证和学习学校的统计数据。
They can stop a unit in its tracks.
他们可以停止在其跟踪一个单位。
The undo engine tracks transactions and creates a single undo unit that encompasses a transaction.
复原引擎会追踪异动，并建立包含异动的单一复原单位。
Then, the candidate targets are regarded as unit, and corresponding attributes as condition attributes. Subsequently the decision system of target's tracks recognition is constructed.
把提取到的特征属性作为条件属性，把每帧图像中候选目标作为个体，构成知识决策系统。
Each Viking consists of two tracked vehicle units linked by a steering unit. All four tracks are driven and the vehicle retains mobility even if a track is damaged by a mine.
每一辆“北欧海盗”BvS10装甲全地形车是由两辆履带式车通过铰接在一起，由四个履带驱动，甚至当其中一个履带被地雷摧毁时车辆也能保持机动性。
Each Viking consists of two tracked vehicle units linked by a steering unit. All four tracks are driven and the vehicle retains mobility even if a track is damaged by a mine.
每一辆“北欧海盗”BvS10装甲全地形车是由两辆履带式车通过铰接在一起，由四个履带驱动，甚至当其中一个履带被地雷摧毁时车辆也能保持机动性。
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