1. The piston travels down on the intake stroke, up on the compression stroke, down on the power stroke and up on the exhaust stroke. 进气行程,活塞下行;压缩行程,活塞上行;做功行程,活塞下行;排气行程,活塞上行。
2. I think I was a butterfly, a butterfly only to their own. A happy butterfly! 我想我是一只蝴蝶,一只只属于自己的蝴蝶。一只快乐的蝴蝶!
3. Our country rhopalocera besides the link butterfly branch, black doctor's fee types and so on spot butterfly, flowered corbicula butterfly has the distribution in this. 我国蝶类除环蝶科外,黑脉金斑蝶、花蚬蝶等种类在此均有分布。
4. Butterfly valves are commonly used for clip-on butterfly valve and two Flanged butterfly valve. 常用的蝶阀有对夹式蝶阀和法兰式蝶阀两种。
5. Our country rhopalocera besides the link butterfly branch, black doctor's fee types and so on spot butterfly, flowered corbicula butterfly has the distribution in this. 我国蝶类除环蝶科外,黑脉金斑蝶、花蚬蝶等种类在此均有分布。