【英语时差8,16】坚果还是种子？（在线收听）

Sometimes You Feel Like A Nut – Sometimes You Really Are One! Y:Hey!Don.What's that you are eating? D:Mix-nuts Yael.Would you like some? Y:Can I see them first? D:Sure! Y:I hate to tell you this ,Don.But there are no nuts in this can. D:There are peanuts, cashews, almonds, pecans, walnuts and Brazil nuts in there.It's all nuts. Y:While those are all commonly referred to as nuts in the culinary world, none of them is really a true nut in a biological sense. D:I am shocked!What defines a nut biologically? Y:Nuts,are made up of both the seed itself and a hard outer layer that is the fruit, which does not split open when ripe.Some examples of true nuts are acorns, hazelnuts and chestnuts.Walnuts, pecans and almonds, in contrast, are edible seeds from a bigger fruit. Most of the inedible fruit is removed at harvest so when you buy walnuts and almonds in the shell, you’re buying the seeds enclosed in woody endocarp, which is the remaining layer of the fruit wall.Brazil nuts are also seeds. They come from a capsule like fruit, in which several of the triangular seeds grow inside, arranged like the segments of an orange.Peanuts are the seeds of a legume, or member of the bean family. Pistachios, cashews, macadamias and pine nuts are all seeds rather than nuts. D:One truth about both “true nuts” and the seeds we call nuts is that they are both rich in healthful omega 3 fatty acids as well as vitamins and protein. Y:And they all taste great.