我有以下几点不明白，请各位帮帮忙：
1. On the other hand, maybe people are just genuinely curious, as they would be if confronted with a dinsaur bone.
if在这里是什么用法？
2. I never get the feeling that they think I'm crazy for riding something so old when I could be fussing with gears and having a presumably easier time of things.
这句话该怎么翻译阿？
3. A time when people thought in terms of settling into a cushioned seat, stopping the movement with their heel and travelling a bit slower than we are travelling now.
这句话是什么意思啊？
4. I just don't get excited over the idea of yet another thing I could do if I pulled the right lever or set the right program.
这句话我怎么也理解不来噢！yet在这里是什么意思阿？
