Aviation benzine is used at piston aviation engine, use quantity is less.航空汽油用于活塞式航空发动机, 使用量较少.Never use volatile fluid such as lacquer thinner , benzine, etc. when cleaning the unit.切勿使用香蕉水 、 汽油等挥发性液体清洁计算器.The aviation ...
a method of smelting iron一种炼铁方法Darby was looking for a way to improve iron when he hit upon the idea of smelting it with coke instead of charcoal.达比一直在寻找改善铁质的方法，他猛然想到可以不用木炭熔炼，而改用焦炭。Fire provided a means of smelting ores....
Through some unfortunate accident, the information reached me a day late.由于发生了不幸的意外，我知道消息的时候已经晚了一天。Every year we have charity days to raise money for unfortunate people.每年我们都有慈善日来筹款帮助贫困人群。It really is desperately unfortu...