1. I shall never understand the workings of an engine.
    我永远搞不懂发动机的工作原理.

2. Imagine their surprise and delight when they broke open the packing cases and found that the fourth engine was sweet as honey----still in perfect condition.
    想一想他们所感受到的惊奇和兴奋 -- 当他们拆开包装箱时，他们发现第4台发动机就像蜂蜜一样甜 -- 发动机完好无损。

3. It was over 30 feet in length and had a 2,500-horsepower engine.
    它的车身长30英尺，有一个2,500 马力的发动机。

4. Fill your radiator with water, or your engine will overheat.
    给你的散热器充水, 否则引擎会过热。

5. Fill your radiator with water, or your engine will overheat.
    给你的散热器充水, 否则引擎会过热。