New Words：

low [ləʊ] adj. 低的;矮的;离地面近的;在底部的;近底部的
upper lip 上嘴唇
lower lip 下嘴唇

Sample Sentences：

The sun is low in the sky.
The island can only be reached at low tide.
At a low temperature, water turns into ice.
She said in such a low voice that I couldn't hear.
The truck is not low enough to go under the bridge.

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