火车烟囱喷出的煤屑和煤烟,纷纷落在田间怒放的野花和毛茸茸的杂草茎节上.The engine sowed cinders and soot over the fiery flowers and the hairy knobs of weed.沿着荷塘,是一条曲折的小煤屑路.Beside the lotus pond there is a small tortuous cinder path....
human immunodeficiency virus or HIV人体免疫缺陷病毒，即HIVThese conclusions have emerged from observations of persons exhibiting different states of immunodeficiency.这些结论是从观察人的各种免疫缺陷症状得出的.About 50 % of Acquired Immunodeficiency Sy...