Act your age, not your shoe size. 按照你的年龄做事，不要按你的鞋号做事。
原来 going to town 的意思就是努力做一件事情，大作一番。
如果某人非常高兴，欣喜若狂就可以用 over the moon 这个短语，比喻一个人欣喜至极甚至都可以飞到月球上去。
If someone says you know your onions, it means you are experienced in something or you know a lot about a particular subject.
