She tried to get a purchase on the slippery rock.
她设法抓牢光滑的岩石。
Princeton or Stanford degree is worth much more than one from Slippery Rock State University.
一个普林斯顿或者斯坦佛大学的学位要比阿狗阿猫大学的文凭有价值得多。
The rock was slippery as a ball, and they had to crawl rather than climb.
岩石滑得像个球，他们无法爬行，只能匍匐前进。
The rock was slippery as a ball, and they had to crawl rather than climb.
岩石滑得像个球，他们无法爬行，只能匍匐前进。
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