The limit for carbon monoxide is 4.5 per cent of the exhaust gas.

尾气中一氧化碳的排放量限制在4.5% 以下。

The exhaust gas exits through the other exhaust manifold .

废气经另外一个排气歧管排出。

Some of the heat leaves the cylinders with the exhaust gas.

一些热量与废气一起排出了气缸。

The exhaust gas from cars pollutes the air and they waste energy.

汽车的尾气污染了空气，浪费了能源。

The exhaust gas from cars pollutes the air and they waste energy.

事实上，汽车尾气污染了空气，浪费能源。