The turboprop engine is very much like the turbojet. it has an additional part, a propeller . 涡轮螺桨发动机与涡轮喷气发动机十分相似。它多了一个螺旋桨部件。
Regardless of apparent complexity, all control systems may be reduced to these essential elements . 一切控制系统，不管它表面上看起来有多么复杂，都可以分解成一些基本部件。
One type is the iconoscope. it contains three essential parts--a mosaic, a collector ring and an electron gun . 一种是光电摄象管，它有三个基本部件--嵌镶光电阳极、集电环和电子枪。
A large number of these cracks occurred because the groove welded component was considered a secondary member or attachment . 发生这许多裂纹是因为把这些坡口焊接部件作为次要构件或附件考虑。
The air swept out the potentially damaging substances before they had a chance to form sludge or corrode parts . 在他们有机会形成油泥或腐蚀部件之前，流动的空气先清除了这些有潜在危险的物质。
There is very little sense in testing an aircraft component or a complete model unless the data are going to be used . 如果只进行全机或部件的模型试验，而不去应用试验数据，那是全然没有意义的。
The shape factor is less for rounder or streamlined objects than for irregular or sharp-edged structures or elements . 对圆形或流线型的物体来说，形状图子要比不规则的或棱角分明的结构物或部件小得多。
These attachments were considered secondary components, so no weld quality control has been imposed on the groove weld splice . 这些附连件被看作是次要的部件，所以在这种坡口焊接中没有进行焊接质量控制。
In many cases, however, the true component environment is extremely complex and it becomes impractical to provide an adequate simulation . 但是，在大多数情况下，真实部件外界条件十分复杂，不可能保证精确的模拟。
This recent instrument includes a built-in fabry-perot interometer calibration unit with an automatic daily recording of a calibration signal . 这种最新仪器包括插入式的法布里-珀罗干涉仪定量部件，可以每天自动记录一次定量讯号。
