A two-stroke engine has no moving valves, and the spark plug fires each time the piston hits the top of its cycle.
二冲程发动机没有移动的阀，火花塞每次点火活塞到达循环顶端。
Note that the compression ratios shown above reflect the expansion ratio, which is the ratio of the combustion chamber volumes when the piston is at Bottom dead centre and Top dead centre.
请注意，压缩比上述反映膨胀率，这是燃烧室的量的比例时，活塞的下死顶死中心，中心会显示。
This pressure rise is so great that a force is exerted upon the top of the piston that is sufficient to force the piston all the way down the cylinder.
压力的大幅度升高使得作用在活塞顶部的力足够大，从而迫使活塞一直延气缸下行。
In some application, a narrow groove is cut into the piston above the top ring to serve as a "heat dam" to reduce the amount of heat reaching the top ring.
在一些实际结构中，一条窄槽切入顶端活塞环的上部，其作用是充当“隔热槽”以减少达到顶端活塞环的热量。
The underside forms the combustion chamber with the top of the piston.
缸盖的下方和活塞顶部形成燃烧室。
The combustion chamber consists of the main combustion chamber on the top of the piston, the auxiliary combustion chamber in the cylinder head and the passage between the main and auxiliary Chambers.
燃烧室由位于活塞顶的主燃室，位于气缸盖上的副燃室和连通主副燃烧室的通道组成。
I guess the only reason is rockets becoming a real top level team. So these teams they beated are "suck"... Maybe after we beat SPUR and PISTON, the people have to admit the changing of rockets.
我猜想，唯一的原因，是火箭成为了一支真正的顶级队伍，因此这些被他们击败的队伍是“糟糕的”…也许我们打败马刺和活塞后，人们不得不承认火箭的转变。
TDC (top dead center) - the position of the crank and piston when the piston is farther away from the crankshaft.
(上止点)-当活塞离曲轴最远时，曲柄和活塞的位置。
The results of calculating and experimenting show that the first and largest slap of impact between the piston and the liner occurs around the top dead center from the nonthrust to the thrust face.
经计算和实验表明：活塞在上止点附近，当活塞由非推力面快速地移向推力面时，对缸套具有较大的冲击能量。
Power stroke: As the fuel is compressed and the piston nears the top of the cylinder the spark plug fires and ignites the fuel and air.
作功行程：活塞处于汽缸中的上止点，火花塞点燃充分压缩后的混合气体。
The Bore is the diameter of the cylinder. The stroke is the distance the piston travels from BDC (Bottom dead center) to TDC (top dead center). The Bore is always mentioned first.
内径指的是气缸的直径；行程是活塞从下止点运行到上止点的距离。表述时，内径总是写在前面。
The temperature of top and skirt of the piston of SANTANA engine is measured by using temperature memory screw, the results are analyzed, and agree with the calculated results of FEM.
采用温度记忆螺钉法对桑塔纳汽车发动机活塞顶部与裙部温度进行了测定，分析了测试结果，并与有限元计算所得结果进行了比较。
The top of the piston is shaped to give the incoming mixture an upward movement. This helps to sweep the Burned gases ahead and out through the exhaust port.
活塞顶部的形状使进入气缸的可燃混合气向上运动，这样有助于扫气，引导燃烧过的废气向上运动并从排气口排出。
This means that when the piston reaches the top of the cylinder, the air-fuel mixture is squeezed to about one tenth of its original volume.
这意谓着，当活塞到达圆筒的顶端的时候，空气燃料的混合被压缩到大约十分之一的它的最初体积。
Natural ventilation that made use of piston wind induced by metro operation at the top opening of metro tunnel is a possible means of ventilation technology.
在地铁区间隧道顶部开孔，利用地铁列车运行产生的“活塞风”进行自然通风换气是一种可能的通风技术手段。
The top part of the piston is the head, or crown.
帽子中盖住头顶的部分。
It's for detection of engine speed, piston top dead center position, signal ignition and injection control in top dead center of each piston.
主要用来检测发动机转速，检测活塞上止点位置，包括检测用于控制点火的各缸上止点信号、顺序喷气的第一缸上止点信号。
It's for detection of engine speed, piston top dead center position, signal ignition and injection control in top dead center of each piston.
主要用来检测发动机转速，检测活塞上止点位置，包括检测用于控制点火的各缸上止点信号、顺序喷气的第一缸上止点信号。
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