根据我的学说,这些近缘的物种是由同一的祖先而来的.By my theory these allied species are descended from a common parent.在腹板与下翼缘的施焊中使用小矩形挡板.Small rectangular backup bars were used to fabricate the web - bottom flange connection.他将汽车停在紧靠人行道路缘的地方.He...
这四枚新邮票是为了纪念英国天文协会成立100周年而发行的。The four new stamps mark the 100th anniversary of the British Astronomical Association.在历史的年代数目和天文年代数目之间存在差别.There are differences between historical and astronomical numbering of years.数学材料是...