The crown extension technique; The root hauling technique; The gum excision; The depth of gingival sulcus.

牙冠延长术；根牵引术；牙龈切除术；龈沟深度。

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One popular technique for hauling lumber was to use horses and oxen to drag logs over skid roads and rough tracks through the woods.

搬运木材的一种普遍手法是用马和牛在森林中的滑道和崎岖小路上拉木头。

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