题目内容
平静的湖面上有一片树叶，现将一粒石子从树叶附近投入水中，会发现这片树叶：
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在纵波中，某时刻两个“疏部”或“密部”之间的距离等于一个波长。
Sure, we can help you plan for a _________ ________.
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That’s right. I was told the best time to visit Tibet is in the ________, October might be a bit __________ _________.
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