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Very few people know that he is engaged in speculative buying and selling.
很少有人知道他做的是投机倒把的生意.
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Their speculative buying of grain is illegal.
他们投机购买谷物是不合法的.
投机性购买???
英汉双解词典包含4367426条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。