背长，倾斜季度和上提的腹部。

Their back was long, with sloping quarters and tucked-up abdomen.

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蝎子的背侧上长有一排被称之为栉状器的独特感应梳。

Scorpions have unique sensory combs, called pectines, on their dorsal sides.

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背压率大于80%，能排不凝结气体，膜盒坚固，使用寿命长，维修方便，使用范围很广。

Back pressure higher than 80%, to row non-condensing gas, diaphragm solid, long life, easy maintenance, using a wide range.

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