当皮肤老化失去弹性的时候，面部线条就不太容易弹回到无痕状态，皮肤下的凹槽就会永久性的在你的脸上形成，变成细小的线条和皱纹。
As skin ages and loses its elasticity, the skin stops springing back to its line-free state, and these grooves become permanently etched on the face as fine lines and wrinkles.
此阀门的优点在于阀体通径无凹槽，介质不会卡阻堵塞，并且具有全通径流通特性，适合粉体颗粒介质的管道中使用。
The advantages of this valve are: body's diameter without grooves, the medium does not plug the card blocking, full-diameter flow characteristics, suitable for powder using in the pipeline.
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