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She says health facilities are a fundamental part of community life and it is important they are designed to be useful in case of emergency.
VOA: standard.2009.10.14
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Some words that are useful in this discussion, a 'host'. A host is the organism that you're interested in defending and it could be you or me or some typical person.
讨论中会用到一些词,宿主 宿主是,你对其免疫反应感兴趣的生物体,可以是你我,或者其他人
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And you will find this pattern useful for when you are talking about something in your memory.
当你在谈论记忆中的某事时，这个句型非常有用。
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You want to give it to children because it's children that are susceptible, and that's where you would like the vaccine to be useful is in children.
你想把疫苗分发给孩子们,因为他们最易受到感染,同时你也希望,疫苗可以对孩子有效
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So the exceptions are useful when you want to have the ability to say, I expect in general this kind of behavior, but I do know there are some other things that might happen and here's what I'd like to do in each one of those cases. But I do want to make sure that I don't let a value that I'm not expecting pass through.
所以当你希望有能力说,我希望一般是这样的行为,异常是很有用的,但是我明白还有一些其它的情况可能发生,我希望对每一种情况都这么做,但是我跟希望能保证,没有让一个预期之外的情况漏过去。
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These patterns of "I've been" are so useful to say what you want to do in the future in relationship to the past.
当你想表达过去与你将来想做的事情之间的联系时，“I've been”句型特别有用，
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- And it's worth--; it's sort of a useful test for asking yourself -- what are the things you must value in life-- to ask, what would you choose to do if you knew you had five years, ten years, ? what have you?
而这值得;,这算是一种很有用的测试,用来问自己什么是你在生命中必须珍惜的事-,问你会怎么选择,如果你知道自己还有5年，10年，之类的时间？
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So again, these "Can" questions are very useful. You can use them in really any situation.
因此，“Can” 问句确实非常有用。你可以在任何语境中用到它们。
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The "Would you" questions are very useful in a variety of settings.
Would you”问句在许多情况下都非常有用。
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So some parents now are choosing to save the cord blood, have it frozen, locked away somewhere just in case its useful to their child later in life.
一些父母现在选择保存脐带血,冷冻储存起来,保存在某个地方以防万一,也许孩子将来用得着
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