名词
中文翻译：购买订单
同义词：
['order to buy', 'purchase order', 'order for purchase']
例句：
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1. They need to place a buy order before the market closes.
他们需要在市场关闭前下购买订单。
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2.The company issued a buy order for the new product.
该公司为新产品发布了购买订单。
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3. The buyer placed a buy order for the goods at the auction.
买家在拍卖会上下了购买订单。