接种物来自北京郊区的稻田土.The inocula were from the suburban rice soil.装在玻璃管中的灭菌棉签适合干剖检时用来采集接种物.Sterile cotton - tipped applicators in individual glass tubes conveniently used to obtain inoculum during the necropsy....
Builders must fasten down roofs of newly-built homes more securely.建造工人必须把新建房屋的屋顶固定得更牢靠些。The holiest of their chapels are topped with gilded roofs.他们最神圣的教堂屋顶镀了金。The paper was used for sealing up holes in walls and roofs....