China's energy firm Sinopec and QatarEnergy have signed an agreement on a 27-year liquefied natural gas sales and purchase deal.

中国能源公司中石化和卡塔尔能源公司签署了一项为期 27 年的液化天然气销售和采购协议。

The amount of Bitcoin in the system must always be counted and tracked. Users' computers that watch and approve Bitcoin sales and purchases are given new Bitcoins.

流通中的比特币必须得到持续的计数和追踪。监视并认证比特币交易的用户电脑能够得到新的比特币。

The study's authors dredged for detailed data on sales and purchases (from transaction ledgers) and on rents and maintenance costs (from rent books) over the period from 1901 to 1983.

该研究的作者挖掘了1901年至1983年期间的销售和购买记录(来自交易账簿)以及租金和维护成本(来自租金账簿)的详细数据。