However, although the old group took longer to learn, eventually, they performed as well as the young group.

然而，尽管老年组花了更长的时间去学习，最终，他们还是表现得和青年组一样。

Oh, wow. I've been so out-of-touch with this group. Well, I'm glad to see she is OK.

" 哦，哇。我都好久没和这群人联系了。看到她没事我真是高兴。

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。