New Words：

grade [ɡreɪd] n. 等级；年级
helicopter [ˈhelɪkɒptə(r)] n. 直升机

Sample Sentences：

The helicopter rose into the air.
I need you to send a helicopter to the roof.

I am a student from Class Eight, Grade Seven.
The children in Class Two Grade Three are very happy, because they're going to be in Grade Four!

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