... be valid for two years 有效期两年； a valid excuse 有根据的理由 → value 价值；有用性，重要性；评价，重视，尊重 ...
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a valid excuse
有效的借口
以上为机器翻译结果，长、整句建议使用 人工翻译 。
What makes a valid excuse?
有充分的理由会怎么样？
youdao
Illness is a valid excuse for being absent from work.
生病是不去上班的正当理由。
In this info age, "I don't know" is not a valid excuse.
在这个信息时代，“我不知道”不再是合理的借口。
U.N.spokesman Gordon Weiss says that cannot be used as a valid excuse.
VOA: standard.2009.04.26
It was a valid excuse to leave the office before 7 pm on a Thursday night and kind of fun to be invited by Webgrrls.
CNN: She's on Top
But just as Michelangelo might have pointed out he was trying to create a masterpiece while lying on his back, Jones also had a valid excuse.
BBC: Jones out to prove his greatness
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