gradeeight是什么意思

　　例句：

　　Wang Zixuan, a student from Grade Eight, with little knowledge of painting, painted a beautiful night scenery on a piece of pottery.

　　王子軒是一個八年級的學生，他幾乎不了解繪畫知識，但卻在一塊陶器上畫了一幅美麗的夜景。

　　I am a student in Grade Eight.

　　我是八年級學生。

　　I teach grade seven and grade eight 's biology now.

　　現在，我教七年級和八年級的生物。