The final step came when steam was introduced into the cylinder to drive the piston backward as well as forward, thereby increasing the speed of the engine and cutting its fuel consumption.
最后一步是将蒸汽引入气缸，使得活塞前后推动，从而提高了发动机的速度，降低了燃料消耗。
2
Campers learn technical skills of roasting, frying and cutting, as well as some recipes that they can take home and share with their families.
营员们学习烘烤、油炸和切菜等专业技能，他们也可以把一些食谱带回家同家人分享。
3
The embroidered designs were based on paper-cuts, the most well-known of them was from Bao Jun, a paper cutting master.