New Words：

quake [kweɪk]
v.震动, 颤抖
n.震动, 地震

earthquake [ˈɜːrθkweɪk] n. 地震

Sample Sentences：

The ground quaked as the bomb exploded.
Every time I get on a plane, I quake with fear.

The town was destroyed by the earthquake.
An earthquake comes like a thief in the night, without warning.

warn [wɔːrn] v. 警告；告诫；提醒注意（可能发生的事）；使警惕

warning [ˈwɔːrnɪŋ]
n.警示；警戒；先兆
v.“warn”的现在分词

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