文章列表

• 1.【英语时差8,16】智齿的演变（下）
• But, if these extra teeth were such an advantage for our ancestors, then why do most people today need to have their wisdom teeth removed? Again, the ...
• 2.【英语时差8,16】智齿的演变（上）
• As we all learned in health class, human beings have 32 teeth. Twenty-eight of them come in before puberty, but the last four teeth, our third molars,...
• 3.【英语时差8,16】会发射紫外线的蜘蛛（下）
• Craig and Bernard did laboratory experiments showing that fruit flies are two to three times more likely to fly toward a simple web reflecting ultravi...
• 4.【英语时差8,16】枫糖浆到底是什么？（下）
• And any year with extreme variations in temperature from night to day tends to be a good year for maple syrup as well. All trees produce some natural ...
• 5.【英语时差8,16】枫糖浆到底是什么？（上）
• If you take a spring walk through the woods in many parts of the Northeast, youll find buckets hanging from the sides of maple trees. Drop by drop, th...
• 6.【英语时差8,16】人类嗅觉的奥秘（下）
• Since most of the smell receptors are located very high up, near the brain, they are out of the main flow of air. As a result, the smell receptors don...
• 7.【英语时差8,16】人类嗅觉的奥秘（上）
• Watch your dog next time you go for a walk chances are it sniffs at anything that might smell interesting. People sniff, too, when theyre trying to pi...
• 8.【英语时差8,16】吸管的工作原理（下）
• This same principal explains how a barometer measures the atmospheric pressure. Since mercury is much heavier than water, the atmospheric pressure can...
• 9.【英语时差8,16】吸管的工作原理（上）
• When you sit down to a glass of iced tea with a straw in it, you might say that you are sucking the tea up through the straw. In fact, a more accurate...
• 10.【英语时差8,16】减肥误区（下）
• And on the flip side, its all too easy to gain weight eating low sugar, low calorie health food, or eating mostly protein, if you eat too much of it. ...