Grafting can join scions with desirable qualities to rootstock that is strong and and insects.嫁接可以使品质优良的接穗接在生命力强而且抗病虫害的砧木上.The aminolignin flocculant was prepared based on calcium lignosulfonate, diethylamine and epichlo...
他强烈要求保留北大西洋公约组织以维护和平。He argues strongly for retention of NATO as a guarantee of peace.镇上老码头区多年来疏于维护,快要塌陷了.The town's old quayside is collapsing after years of neglect.埃塔尔的修道士把修道院维护得很好。The monks of Ettal keep the abb...