...一)试解释航空发动机推进效率（Propulsion efficiency）、热效率（Thermal efficiency）、 螺旋桨效率 （ Propeller efficiency ）、与整体效率（Overall efficiency）的定义。
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open water propeller efficiency 螺桨单独效率
open propeller efficiency 螺旋桨敞水效率
behind ship propeller efficiency 螺旋桨船后效率
behind Propeller efficiency 桨模随艉效率
open-water propeller efficiency 螺旋桨敞水效率
propeller efficiency behind ship 螺旋桨船后效率
propeller of optimum efficiency 最佳效率推进器
propeller static efficiency 螺旋桨静态效率
This avoids the use of a traditional propeller shaft and puts the propellers in a clear flow of water, which greatly improves efficiency.
这样就避免了使用传统的螺旋轴，将螺旋桨置于干净的水流中，从而大大提高了效率。
Usually, the fullest efficiency of screw propeller is 75% with the rest energy lost in the way of whirlpool.
通常螺旋推进器最大效率为75％，其余的能量以漩涡的形式损失。
Some pumps used for 1000 hours, the ship propeller in the use of time is also greatly reduced because of the efficiency of air piping.
某些水泵使用1000小时左右即出现严重的空蚀，船舶螺旋桨在使用一段时间后也因空蚀而效率大大降低。
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