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。
The task executes when it receives business items A and B, or C and D, or B and C as inputs.
任务在接收到业务项A和B，或C 和D，或B 和 C作为输入时，该任务将执行。
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。
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。
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