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来源:雅诚德英语网
The chewing surfaces of back teeth are rough and uneven because they have small pits and grooves.
后磨牙的咀嚼面是粗糙和不平的,因为它们有小的凹陷和沟槽。
The chewing surfaces of back teeth are rough and uneven because they have small pits and grooves.
后磨牙的咀嚼面是粗糙和不平的,因为它们有小的凹陷和沟槽。