He did not vouchsafe a reply.他未予答复.to vouchsafe a reply给予答复Elinor would not vouchsafe any answer.埃莉诺不想给予任何回答.Vouchsafe me a spirit of faith and knowledge.赐予我信心和一颗有知识的心灵....
In covalent bonding, atoms share electrons.在共价键联中, 原子共有电子.Crystals may be classified as either ionic or covalent by analogy with molecules.与分子的情况一样,晶体也可以分为离子键型和共价键型.Ceramics primarily have ionic bonds, but covalent bondi...