However, facts A, B, and C are never used again; they were instrumental to the argument because they allowed one to establish D, but once D is established, A, B, and C can be safely forgotten.
然而，A,B和C再也没有被使用到；他们只是辅助性的证明，因为它们被用来建立D，然而一旦D被建立起来后，A,B,C可以被毫无顾虑地忘掉。
If a user's PATH is set to a: B: c: d, the shell first attempts to find the command in directory A. If it isn't found there, the shell moves on to look in directory B and so on.
如果用户的PATH被设置为A：B：C：D，那么shell将首先尝试在目录a中查找命令。
Our ovens can be traced to the Han Dynasty(206 B. C. to A. D. 20). The heating source, natural smoke and heat, is derived from split oak or seasoned wood.
我们的“红炉”烤箱可以远溯到两千多年前的中国汉朝（公元前206-公元20年），其内部热量完全来自于原木及稻草的燃烧与烟熏。
Professor Smith promised to look my paper, that is, to read it carefully before the defence. A. after B. over C. on d.
into史密斯教授已经答应帮我看一下我的论文，这就是说要在答辩前在仔细看一下。
Professor Smith promised to look my paper, that is, to read it carefully before the defence. A. after B. over C. on d.
into史密斯教授已经答应帮我看一下我的论文，这就是说要在答辩前在仔细看一下。
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