... Back pocket length 后袋深 BACK POCKET DEPTH 后口袋深 in ones back pocket 在某人裤子后口袋里 ...
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In one technique, called pocket depth reduction, the periodontist folds back the gum tissue, removes the bacteria, and secures the tissue into place so that it fits more tightly around the teeth.
在一种叫做翻瓣术的手术，牙周病医师翻起牙龈组织，清除细菌，保证组织回到原位置，让它和牙齿贴合更紧密。
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