New Words：

plus [plʌs] 加;和
minus [ˈmaɪnəs] 减;减去;零下

Sample Sentences：

Two plus five is seven.
Two plus five makes seven.
What's seven plus nine?

Seven minus three is four.
Nine minus five leaves four.
The temperature is now minus 10 degrees.
The temperature went down to minus ten last night.

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