If you flip the Periodic Table over you will have the ionization energy of sodium, first ionization energy, 5eV and it is about 5 eV which, when you convert, 496kJ/mol is a whopping 496 kilojoules per mole.

如果浏览周期表,你可以得到钠的离子化能，第一电离能，大约，当你转换的时候，是巨大的。

麻省理工公开课 - 固态化学导论课程节选

Now today, the standard mortgage, which you would probably get when you buy your first house, is not fifteen or twenty--it's thirty years.

今天,标准的抵押贷款,当你买第一套房子时你或许就能得到,期限不是15或者20年,而是30年

耶鲁公开课 - 金融市场课程节选

That's because, well, when you buy your first house you might be twenty-five, so thirty years brings you to age fifty-five; that's close enough to retirement.

这是因为,你可能在25岁时买第一套房子,当还清30年的贷款时你已经55岁了,都快退休了

耶鲁公开课 - 金融市场课程节选