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道沟槽

道沟槽

道沟槽

道沟槽

1

He took his pocketknife and in the big oak made a groove .

他拿出他的随身小折刀，在大橡树上划了一道沟槽。

2

3

The venom (a neurotoxin) is conducted along grooves in the teeth from glands in the lower jaw . Bites are rarely fatal to humans.

多数牙上有两道沟槽，以便引出下颚的毒腺的分泌物，内含神经毒素，但很少能致人死亡。

4

The friction unit assembled , showing the teeth engaged in the two grooves , is shown below .

装配完成的摩擦单元装配中，齿牙卡在两道沟槽里，如下图所示。

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