New words：

drift [drift]
v.漂移；漂流；飘；缓缓移动
n.趋势；漂流；趋势

iceberg ['aisbə:g] n. 冰山

Sample Sentences：

Clouds drifted across the sky.
I'm sorry, I got bored and drifted off.
There was a drift of smoke above the trees.
Most of the iceberg is under the water.
The Titanic sank after hitting an iceberg in the early morning hours of April 15, 1912.

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