1·So, that's his gift to us: the Lewis structure, and the idea that you could share electrons and form a covalent bond.
这就Lewis给我们的礼物，Lewis结构，你能够通过公用电子，形成共价键。
2·What's the definition of the covalent bond?
共价键的定义是什么？
3·OK, he also, let me see, he also, lastly, to close us out, he also developed an analytical expression for the energy of that covalent bond, which is really what we want.
好的，他也，让我看看，他也，最终接近我们的，他也发明了一种分析方式，对于共价键能量来说，这是我们真正想要的。
4·The slide surface combines with the coating via the strong covalent bond, and overcones PLL and APS's shortcomings of short shelf life.
载玻片表面与涂层以牢固的共价键方式结台，克服PLL及APS保质期短的缺点。
5·Most of Genotoxic carcinogens are electrophiles that bind with DNA, and they interact directly with DNA and form covalent bond, resulting in DNA-carcinogen complexes, or DNA adducts.
大部分的遗传毒性致癌物是与DNA结合的亲电子试剂，它们直接与DNA相互作用，形成共价键，从而形成DNA -致癌物复合体，或称之为dna加合物。