Very few people know that he is engaged in speculative buying and selling.
很少有人知道他是做投机倒把生意的。
Buying houses for nothing and selling it after the price rises is speculative.
买了房什么也不干，等房子涨价后卖掉，这属于投机。
Buying houses for nothing and selling it after the price rises is speculative.
买了房什么也不干，等房子涨价后卖掉，这属于投机。
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