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请将下列段落翻译成汉语：there are three hydraulic systems in A320/B737. If one of them fails, we can switch to other working hydraulic system. They can provide hydraulic power, too, so it won’t affect flight safety.
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Corporal punishment has been practiced in familites for quite a long time. In recent years, people's attitudes towards this practice have undergone drastic changes. Nowadays many people strongly oppose it. Should corporal punishment be abolished?请根据所给内容，拟写一个议论文开头。
用完整句子回答下列问题：1) What's the function of hydraulic system?2) What would be the possible consequences of hydraulic failure?3) What will you do if there is hydraulic failure during flight?
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