You are twenty-one, a grown-up young lady old enough to make up your own mind.
你已经21岁了,已经到了可以自己做主的年龄了。
I think his fish is a little bigger than mine.
他的鱼似乎比我的大了一点。
but one day, after heavy shower, I happened to be walking in my garden when I noticed a huge number of snails taking a stroll on some of my prize plants.