Such estimates should be considered only as crude approximations.上述估算结果只能是粗略的近似值.There are two approaches generally used to arrive at these approximations.通常有两种方法用于获得近似解析式.They are not second - order approximations, but ...
他精通机械，了解许多有关声音的知识。He was a very mechanical person, who knew a lot about sound.男孩和女孩会喜欢摆弄各种机械装置。Boys and girls will enjoy messing about with any kind of machine.在报关单上，寄货人将货物列为农用机械。On the customs declaration, the sender la...