New Words：

alert [ə'lə:t]
n.警报；警惕；警戒；戒备
adj.警觉的；警惕的；戒备的；意识到
v.向…报警；使警觉；使警惕；使戒备

Sample Sentences：

The alert leopard went up to a deer quietly.
We must be alert to the possibility of danger.
The boy was alert in answering the stranger's questions.
Although he's over eighty his mind is still remarkably alert.

Soldiers and police have been put on alert.
The doctor alerted me to the danger of a heart attack.

remarkable [ri'mɑ:kəbl] adj. 非凡的；奇异的；显著的；引人注目的
remarkably [ri'mɑ:kəbli] adv. 非常；极为；格外；出乎意料地

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