英语语法分析

Distribution: two overhead camshafts, 16 valves.

分布：两个顶置凸轮轴，16气门。

The chain drive consists of a duplex roller chain which drives both intake and exhaust camshafts.

链条驱动机构包括一条双排辊链，通过它来驱动进气和排气凸轮轴。

Some high-performance engines have two separate camshafts, one for each set of inlet and exhaust valves.

一些高性能发动机有两个单独的凸轮轴，分别负责开关进气门和排气门。