1635年，rifle作为英语单词出现在一条专利中。这是一条在枪膛中刻凿膛线的专利。
In 1635 the word rifle appeared in English in a patent for cutting these grooves in gun barrels.
简述了板石矿业公司上青矿640主运输平巷在硐口段施工过程中，克服地质条件复杂、多变的现状，采用撞楔超前支架法施工，硐口掘凿获得成功。
The geological condition is complicated and varies often. Using the method of pre-support through hammering wedge, the cave mouth digging work of No. 640 main transportation channel was successful.
摘要目的：通过同体对照方法，比较微创法与传统凿骨劈冠法拔除下颌低位近中阻生第三磨牙的临床效果。
Abstract: Objective: To compare the effects of minimally invasive surgery and traditional method in removal of impacted mandibular third molars.
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