A put option is a contract that gives its owner the right to sell an asset at a future date at a predetermined price.
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，这一点在heLLoword翻译官方下载中也有详细论述
园所性质：这个我觉得跟费用是挂钩的，看个人情况，私立我就不提了没那个财力不考虑，简单说一下公办、普惠的区别：
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Цены на нефть взлетели до максимума за полгода17:55