本发明还提供用于这种牙刷的可替 换的头部。
The invention further provides replaceable heads for such a brush.
本文的目的是证明关于结合环可换性的三个定理。
The object of this paper is to prove three theorems of associated ring's commutativity.
本文的目的是证明关于结合环可换性的三个定理。
The object of this paper is to prove three theorems of associated ring's commutativity.
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