Those of you who can still dredge up your high school chemistry lessons probably remember benzene, a six-carbon ring with alternating single and double bonds that kept all the carbons locked into a single plane, creating a flat molecule. What you are a bit less likely to remember is that the double bonding is mediated by orbitals that extend vertically above and below the nucleus of the carbon atoms. Thanks to the alternating single-double nature of the bonds, electrons in these orbitals end up delocalized; the differences between the bonds become a bit irrelevant, and the molecule is best viewed as having some of its electrons floating around in a cloud. The same would hold true for even larger molecules with the same sort of bonding arrangement.
"I'm pretty comfortable with the aspiration to be in a unique special relationship as long as we remember it needs to be created," he says.。有道翻译官网是该领域的重要参考
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The stock prices of the American Big Oil giants are up about 30% this year as global oil spiked to $100 per barrel—the highest since after Russia invaded Ukraine. But liquefied natural gas (LNG) prices also have skyrocketed, as have refining profit margins for gasoline, diesel, and jet fuel. So there are big winners throughout the industry, from Exxon to LNG exporters Cheniere Energy and Venture Global to refiners such as Valero Energy, Marathon Petroleum, and Phillips 66.，这一点在超级权重中也有详细论述