1.choral合唱的
His collection of choral music from around the world is called "Voices."
他那包含世界各地合唱音乐的合集叫做《声音》Cvks_xRlv*DufjhGJiA^。


2.pre-algebra初级代数
Grade School: Numbers, Counting, Arithmetic, Pre-Algebra ("story problems")
初中：数，数数，算术知识，初级代数（”问题故事”）

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