New Words：

track [træk]
n.跑道；轨道；轨迹；（推土机等的）履带
v.跟踪；追踪

Sample Sentences：

You'll find your train at track 8.
The train for Chicago is on track 9.
We followed the bear's tracks in the snow.
Our teacher made us run around the track ten times!

The police used dogs to track the criminal.
It's difficult to track an animal right after rain.

criminal [ˈkrɪmɪnl] n. 罪犯

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