在古巴，因特网被严格管制，出售那些属于医生、教授和计算机技术人员账户时间的人都是秘密进行交易。
The Internet is strictly regulated in Cuba, so those who sell time on accounts that belong to doctors, professors and computer technicians do so on the sly.
期货合约涉及在指定时间和以指定价格，出售或购买一定数量商品的义务。
Futures contracts involve the formal obligation to sell or buy a given amount of a commodity at a specified time and price.
你出售时间和劳力换来薪水。
You sell them your time and labor in return for your salary.
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