If there is only cylinder tanklife impact, increased by 2 to 3 times the rolling technique of boring grinding efficiency over 3 times.
油缸使用寿命若只考虑缸筒影响，提高2 ~ 3倍，镗削滚压工艺较磨削工艺效率提高3倍左右。
3
She knew that her quality of life was increasingly tethered to an oxygen tank, that she was losing her ability to get about, and that she was slowly drowning.