"Once and only once" is the Extreme Programming phrase.
“一次且仅一次”是极限编程的座右铭。
Use QoS 2 when a message is to be delivered once and only once.
当消息仅传递一次时，使用QoS2。
Why do you think the essence of good design is once and only once?
似乎你曾经给出的唯一理由是好的设计可以提高开发速度。
And remember, you only live once, but if you live it right once is enough.
记住，你的生命只有一次，但是生活态度正确一次就足够了。
Transport reliability has similar performance concerns but the interesting benefit is once-and-only-once delivery.
传输可靠性有类似的性能问题，但是其令人感兴趣的好处是一次且仅一次传送。
There is someplace that you once go and would not like to leave and some one that you would only meet once in your whole life.
有一个地方，你去了就不想离开，有一种人，你一辈子只会遇见一次。
There is someplace that you once go and would not like to leave and some one that you would only meet once in your whole life.
有一个地方，你去了就不想离开，有一种人，你一辈子只会遇见一次。
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