I could provide you with the addresses of at least three illegal drinking dens.我可以为你提供至少3处非法饮酒窝点的地址。Female bears tend to line their dens with leaves or grass.母熊往往会在洞穴里垫些树叶或草。In winter bears usually hibernate in their den...
The axenic culture of rusts has been achieved on various defined media.在各种规定的培养基上可得到锈菌的单体纯净培养物.Copper nails are better than iron nails because the iron rusts.铜钉比铁钉好，因为铁会生锈。Copper nails are better than iron nails because ...