文章列表

• 1.【英语时差8,16】空中舞蹈（下）
• By bending arms and legs or angling her bodypresenting more or less surface area to the groundshe can change her rate of fall, slowing or speeding up ...
• 2.【英语时差8,16】跳伞的科学依据（下）
• Why not? She has reached whats known as terminal velocity. This is when the upward push of air resistanceor the friction she experiences as she falls ...
• 3.【英语时差8,16】喝饮料与运动的共性（下）
• Dehydration is big problem in all these sports because you dont feel like youre losing water. If you run or lift weights, the sweat acts as a psycholo...
• 4.【英语时差8,16】怎样快速将汤变凉
• Why does blowing on hot soup help to cool it off? Its because of evaporation. Evaporation cools down a liquid because the most energetic molecules lea...
• 5.【英语时差8,16】电子烟真的安全吗？（上）
• E cigarettes are battery-powered tubes that look like real cigarettes. But instead of inhaling and getting a lungful of tobacco smoke, you basically s...
• 6.【英语时差8,16】电子烟真的安全吗？（下）
• Many health researchers are dubious, though. A 2009 FDA study of e cigarettes found trace amounts of diethylene glycol a solvent linked to kidney fail...
• 7.【英语时差8,16】雪会说话？（上）
• Probably all, or nearly all, who have experienced a cold winter, are familiar with the cheery cry of the snow as it is pressed against a hard surface ...
• 8.【英语时差8,16】空中舞蹈（上）
• A skydivers body is in a delicate balance. Gravity tugs her downward with a constant, relentless force, while air resistance pushes her upward. The fa...
• 9.【英语时差8,16】雪会说话？（下）
• Snowflakes are small ice crystals. Snowflakes near their melting temperature can, through hand pressure, be made to fuse into a snowball by a process ...
• 10.【英语时差8,16】面包红酒相似性（上）
• Bread and wine make fine companions in a picnic basket, but the two have more than that in common. To make either one, the baker or the vintner has to...