She has conducted on London buses for twenty years.

她伦敦公共汽车上担任了二十年的售票员。

The campus is different from how it was 20 years ago).

校园和二十年前的样子一样了）。

We may as well assert that because a child has thriven upon milk, that it is never to have meat, or that the first twenty years of our lives is to become a precedent for the next twenty.

你还如说，因为一个孩子是奶长大的，所以他永远该，者说，我们一生的开头二十年应该成为第二个二十年的先例。