背叉（vent） 指背缝下部开叉。
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.
叶背毛为较稠密的长柄树状毛、长柄叉状毛、长柄单枝毛和长柄、腺细胞大的粘性腺毛的泡桐为高度抗病。
Leaves with dense long stalk dendroid trichome, long stalk forked trachoma and long stalk trichome with big glandular cells were resistance to the disease.
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.
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