"Once well underground," he said, "you know exactly where you are."
“一旦到了地下，”他说，“你就知道自己在哪儿了。”
Every report item line is printed exactly once.
每一个报告项都严格只打印一次。
Proof that every report item line is printed exactly once.
证明每一个报告项都严格只打印一次。
Once you told me something, I don't remember exactly words.
有一次，你对我说了一些话，我记不清准确的事什么话了。
He wasn't exactly a stranger - I had met him once before.
他不能算是个陌生人—以前我已见过他一次。
The initialization happens first and exactly once.
从初始值开始执行一次循环序列。
Match the lowercase letter exactly once by typing 1.
键入1，以指定仅匹配小写字母一次。
Uses the digits 1 through 9, in that order and exactly once each.
按顺序使用数字1到9，每个数字正好使用一次。
Uses the digits 1 through 9, in that order and exactly once each.
按顺序使用数字1到9，每个数字正好使用一次。
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