事实上，大多数国家需要突然扩增化验室测试，以检测病毒的存在，追踪其轨迹。
In fact, most countries need a sudden explosion of laboratory testing to detect its presence and follow its tracks.
它自带时间模式，这能帮助你追踪头脑风暴的的轨迹。
It comes with timer mode, which will help you to keep track of your brainstorming mind.
他告诉记者，磁北极每年以50千米(约30英里)的速度移动，如今科学家使用人造卫星追踪磁极移动的轨迹。
He told us that magnetic north is moving at a speed of 50 kilometers - about 30 miles - every year. He said that scientists nowadays use satellites to track the changes.
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