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Why refrigerators hum? Why refrigerators hum，on toay's moment of science.On the recent program we have discussed how fluorocarboncoolant cools your food by coming to a boil in coils hidden in your fridge. How is this possible? When you boil water o
英语听力文摘 English Digest
Drought For those of us lucky enough to always have enough food and water, it may be hard to imagine living through a drought . A drought occurs when for a variety of reasons, usually including a lack of rainfall and warm temperatures. Soil moisture
英语听力文摘 English Digest
Cant Sleep? Warm Your Hands! 睡不着？暖暖手吧！ Ya?l: You okay, Don? Don: Sorry,Ya?l . I've been having trouble sleeping lately. Y: Have you tried thinking warm thoughts about your hands and feet? D: Uh,No. Why would I wanna do that? Y: Beca
英语听力文摘 English Digest
Honeybees in Winter 一只蜜蜂无法度过严寒的冬天。一群蜜蜂则不同。据说蜂箱中的蜜蜂要过冬的时候，往往要抱成一团。最外面的一层是工蜂，它们拼命地煽动着翅膀，像厚厚的衣服一样阻隔着外
英语听力文摘 English Digest
It's a common enough sound in summer, after the wind finally picks up on a hot and humid afternoon, as the rain starts spattering down in big, fat drops--you're in for a full-blown thunderstorm. It's much less common in winter, even during a snow sto
英语听力文摘 English Digest
Daily Life - Dinnerware When inviting friends over for a dinner party you always want to make a good impression. No one really wants to eat on paper or plastic plates. That is why having proper dinnerware is very impor- tant.
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