When a large object impacts the Earth, it makes a crater.当巨大物体撞击地球时，就会产生凹坑。With a telescope you can see the huge crater of Ve - suvius.用望远镜你能看到巨大的维苏威火山口.Lava boiled up from the crater of the volcano.熔岩从火山口里滚滚喷出....
In contrast, overexpression of dpr 2 causes developmental defects in midline mesodermal tissues a phenotype resembling oep.与此相反, 在胚胎中过量表达dpr2,可以导致胚胎中线中胚层组织发育缺陷,引起类似oep的表型....
书中有20张有关男性时尚的彩色插页。There are 20 full-colour pages of fashion for men.八页的保健插页an eight-page pull-out on health这本杂志有一张关于国外度假的特别插页.The magazine contains a special insert about holidays abroad....
The address is 2025 M Street, Northwest, Washington, DC, 20036.地址为华盛顿特区，西北区，M大街2025号，邮政编码20036。Take the northwest road; it is the shortest way.走向西北的那条路, 那是最近的路.He was born in the northwest.他出生于西北部....