There are a few different types of steam engine, but we’ll focus on the basic reciprocating type.

有几种不同类型的蒸汽机， 但我们将重点介绍基本的往复式蒸汽机。

There are a few different types of steam engine, but we'll focus on the basic reciprocating type.

有许多不同类型的蒸汽机 但我们将专注于简单的往复式。