Some people think it is a good thing to donate blood for it could save somebody's life while others insist that we should not donate blood for it may cause some illnesses.
有些人认为献血是一件好事，因为它可以挽救某人的生命，而其他人坚持认为我们不应该献血，因为这可能会导致一些疾病。
In one word, water is scarce for all of us and we should try our best to save it.
总之，水是对我们大家都是稀缺的，我们应该尽最大努力保护它。
In a word, we should save time. Time is limited and so, very precious. It will not return any more when it is gone.
总之，我们应该珍惜时间。时间是有限的，所以是珍贵的。当它过去了就再也不会回来了。
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