We also know that there's a phenyl group on the third carbon.

我们还知道第三个碳上有一个苯基。

They're a phenyl group joined by a methyl group instead of just directly.

它们是一个由甲基连接的苯基， 而不是直接连接的。

When benzene is used as an attachment, we call it a phenyl group, so this is 2-phenylhexane.

当苯用作连接物时， 我们称其为苯基， 因此这是 2-苯基己烷。

If one of the hydrogens is replaced with a phenyl group, well that chemical was first derived from trees in the Styrax family, so it's called styrene.

如果其中一个氢原子被苯基取代，那么这种化学物质首先来自苏合香科的树木， 因此被称为苯乙烯。