What was neat about it is before that time, the predominant species to use for air conditioning or refrigeration was ammonia.
在这之前是很整洁的,之前最主要的用于空调或者冰箱的,物质是氨。
Up until then they had been using the old stadium, which now has been turned into a park.
在那之前,他们一直使用旧体育馆;现在旧体育馆已经成为一个公园了。
Milton surveys the wealth of literary tradition before him, and he resists its allure without the help of any human guide.
弥尔顿在他之前就调查过文学传统的宝藏,他在没有人帮助的情况下抗拒了这一诱惑。
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