His coat was caught by a projecting nail on the wall.他的外套被墙上的一颗铁钉钩住了。With the X - frames projecting into the boxes, the transverse diaphragms were formed.把这些 X 框架放进这些箱体, 就成了横隔梁.In the diagram, the outer portions ofthe pr...
科学家仍在研究这种化合物如何阻止病原菌侵染细胞.Scientists are still studying how the compound prevents pathogens from infecting cells.人们用光学显微镜,在受侵染的寄主中观察到这些微生物.Many of these microbes were observed in the infected host by light - microscope.伤口露...