The oxygen sensor is widely used on modern cars is one of the sensors, the normal operation of the engine and exhaust emission control plays a vital role.
氧传感器是现代轿车上应用广泛的传感器之一，对发动机的正常工作和尾气排放控制起着至关重要的作用。
Therefore, business website search engine optimization is only one way operation.
所以搜索引擎优化只是企业网站运营的其中一种方法。
The engine was very smooth in operation but had one very marked disadvantage-thermal efficiency was only about 4 %.
该机在运转方面是很平稳的，但有一个明显的缺点，热效率仅为4 ％左右。
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