But the fossil creatures had spiny limbs sprouting from their heads and circular, plated mouths, which opened and closed like the diaphragm of a camera.
这种生物头上伸出带刺的肢体，扁圆形的嘴巴就像照相机的光圈一样开开合合。
2
Options include direct acting and diaphragm type operations in a Normally Open or Normally Closed version.
可选包括直接作用和隔膜式常开或常闭版本。
3
Sanitary pump is single stage, single suction, full closed stainless steel centrifugal pump or pneumatic diaphragm valve.