New Words：

pure [pjʊr] adj. 纯的；纯净的；纯粹的；不掺杂质的
Celsius [ˈselsiəs] adj.摄氏的

Sample Sentences：

The ring is made of pure gold.
Water boils at 100 degrees Celsius.
Water freezes at 0 degrees Celsius.
The fields were all covered with pure white snow.
Pure water sometimes does not freeze until it reaches minus 40 degrees Celsius.

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