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重点讲解：
1. be known as 称为；叫做；
The Qinghai-Xizang Plateau has long been known as the roof of the world.
青藏高原素有世界屋脊之称。
2. at least （数量）至少，不少于；
He had been sitting on the document for at least two months.
他已经将这份文件压了至少两个月。
3. pick out 辨认出；分辨出；
The detective-constable picked out the words with difficulty.
探警费力地辨认出这些文字。
4. up to 高达；多达；
I can take up to four people in my car.
我的汽车最多能带四个人。
