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Objective: To study the pattern of dental development and tooth age.
目的：研究儿童牙齿发育的规律及牙龄。
youdao
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The decorative pattern on the wall is a little bit mottled with age.
因为年代太久远了，墙上的花纹都有些斑驳。
youdao
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The decorative pattern on the wall is a little bit mottled with age.
因为年代太久远了，墙上的花纹都有些斑驳。
youdao