He USES cover slips to prepare permanent visual records.

他用盖玻片来准备永久标本。

youdao

This is an approach to crop production that is based on three principles: permanent soil cover, minimum soil disturbance, and crop rotations or crop associations.

保护性农业是一种作物生产手段，它基于三个原则：永久性土被，最低土壤干扰，以及轮作或作物关联。

youdao

The news release, echoed by the news media, claimed that Greenland had lost 15 percent of its permanent ice cover from 1999 to 2011.

由媒体发布的新闻稿，一再声称从1999年到2011年，格陵兰岛丧失了15%的永久冰雪覆盖。

youdao

Go ahead and let the Bush tax cuts expire on the theory that the government needs extra revenues to cover the higher spending or should he try to ? make the Bush tax cuts permanent, Ken Judd?

第一种是让布什减税政策自动终结，然后增税,这个倒也在情在理，毕竟政府需要,额外增加财政收入，来承担高额的财政支出,第二种是，采取措施,让该政策继续生效，肯·贾德，你怎么看？

斯坦福公开课 - 经济学课程节选

Of these freshwater resources, about 24 million km3 or 70% is in the form of ice and permanent snow cover in mountainous regions, the Antarctic and Arctic regions.

FORBES: Connect

Whether Nigeria can afford to hire him on a permanent or temporary basis may depend on their ability to cover that kind of salary, but it may be a gamble worth taking on the "wily old fox" - as Russia coach and fellow Nigerian wish-list candidate Guus Hiddink referred to him.

BBC: Why Trapattoni would suit Nigeria

Also show are agricultural land use and land surfaces with little or no plant cover - such as bare ground, urban areas and permanent snow and ice.

BBC: How Earth's land is used