背叉（vent） 指背缝下部开叉。
公司生产的刀具系列有：木工铣刀、合金排钻、锋钢钻头、叉刀、背刀、立轴刀、圆锯片等；
Series produced by the tool are: woodworking cutter, alloy discharge drilling, drill steel front, the fork blade, back blade, vertical knife, circular saw blades, etc.
在延髓，ER分布于舌下神经核、迷走神经背核、三叉神经脊束核、孤束核和网状结构；
In the medulla oblongata, ER distributed in the hypoglossal nucleus, dorsal nucleus of vagus nerve, nucleus of spinal trigeminal tract, nucleus of solitary tract and reticular formation;
用餐时叉齿朝下，用叉背盛放食物。这可是个需要长期练习的技巧。
The fork is held tines down so food is scooped on to the back of the fork. This is a skill that takes time to master.
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