New Words：

shadow [ˈʃædoʊ]
n.阴影；影子；昏暗处
v.跟踪；盯梢；在…上投下（或覆盖）阴影

Sample Sentences：

All he could see was his shadow.
You can't spend all your life chasing shadows. 追求虚无缥缈的东西
The trees threw long shadows across the lawn.
He was shadowed for a week by the secret police.

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