文章列表

• 1.【英语时差8,16】为何食盐中含有碘？2
• Before iodized salt became available, people living near seacoasts got adequate iodine because seawater and coastal soil contain iodine compounds. On ...
• 2.【英语时差8,16】为何食盐中含有碘？
• Pure, ordinary salt is simple. The scientific name for it is sodium chloride. But the label on a salt box shows that table salt usually contains more ...
• 3.【英语时差8,16】食物是如何消化的？2
• At night when the res no food in your stomach, the protease is deactivated so it stops working. Unfortunately, disease, alcohol, and some drugs can ov...
• 4.【英语时差8,16】食物是如何消化的？
• The human body is capable of digesting a very wide range of foods, including sugars, fats, and proteins. But the trick to such a varied diet is in the...
• 5.【英语时差8,16】为何世界大部分为空白？2
• Sure, you think the world is full of solid objects. You think the radio youre listening to is solid. You think the floor youre standing on or the chai...
• 6.【英语时差8,16】为何世界大部分为空白？
• Sure, you think the world is full of solid objects. You think the radio youre listening to is solid. You think the floor youre standing on or the chai...
• 7.【英语时差8,16】奥尔特云与彗星
• The Oort cloud is a spherical haze of comets that surrounds our entire solar system. We often get the false impression that the solar system ends with...
• 8.【英语时差8,16】婴儿牙牙学语2
• Perhaps the baby isnt hearing properly, or perhaps the problem is cognitive. Or, as is sometimes the case, the babys parents arent speaking to the bab...
• 9.【英语时差8,16】婴儿牙牙学语
• Perhaps the baby isnt hearing properly, or perhaps the problem is cognitive. Or, as is sometimes the case, the babys parents arent speaking to the bab...
• 10.【英语时差8,16】动物界的染色体有何不同？2
• But whats true for mammals isnt always true for the rest of the animal kingdom. The sex of baby birds is also determined by two different sex chromoso...