Not only is it valid, it must be valid. And why is that?
不只有效,而且肯定有效,为什么呢?
KAREN: a prescription must be valid. It cannot be an expired prescription.
凯伦:处方必须是有效的,不可以是过期的处方。
Your tests must be valid and reliable; in other words, your tests must be repeatable.
测试必须是有效且可靠的;换言之,测试必须是可重复的。
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