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piston-recess
 piston recess
auto. 活塞顶部 凹坑
| diameter
 diameter
avia. 光学镜头的放大倍数
earth.sc. 粒径
econ.
met. 对径; ;
space 横截面
tech. 直径; 透镜放大倍数

to phrases
piston recess
auto. 活塞顶部气门凹坑
piston-recess: 2 phrases in 1 subject
Automobiles2