他从没爬过危险的山，但他曾爬过一些很大很难爬的山。
He has never climbed a dangerous mountain, but he has climbed some quite big and difficult ones.
我认识一个参加过世界各地登山探险的人。他曾攀登过阿尔卑斯山、喜马拉雅山和洛矶山。
I know a man who has been on climbing expeditions in many parts of the world. He has climbed in the Alps, the Himalayas, and the Rocky Mountains.
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