文章列表

• 1.【英语时差8,16】不粘锅的奥妙（下）
• Getting this slippery substance to stick to a frying pan is a bit of a trick. Teflon is broken into a fine powder and suspended in water. The pan is t...
• 2.【英语时差8,16】不粘锅的奥妙（中）
• it's the fluorine atoms that give teflon its slipperiness, fluorine atoms are physically bigger than hydrogen atoms, it's large size makes them h* aro...
• 3.【英语时差8,16】不粘锅的奥妙（上）
• Teflon is the trademark name for PTFE, a type of plastic. If you own any non stick cookware, then you probably use PTFE on a daily basis. You might no...
• 4.【英语时差8,16】狼到中年（下）
• Why? Because unlike lions, tigers, and other large predators, the average wolf doesnt have the bulk or attributes to take down large prey with a singl...
• 5.【英语时差8,16】狼到中年（上）
• Picture an elk walking through the forest, looking for some berries to nibble. Then, suddenly, a pack of wolves leaps from the bushes, surrounding the...
• 6.【英语时差8,16】猫是“色盲”（下）
• But cat eyes do have some cones, and with work cats can learn how to distinguish between colors. In experiments, scientists have taught cats to discri...
• 7.【英语时差8,16】猫是“色盲”（上）
• You can look at that quilt your cat is curled up on and see a patchwork of greens, blues, and yellows. Your cat, however, cannot see color variation i...
• 8.【英语时差8,16】“变性”的蛋白（下）
• Heating the goo causes the coiled up proteins to unwind, or denature, exposing the water-hating red lights to water. To keep dry red lights from neigh...
• 9.【英语时差8,16】“变性”的蛋白（上）
• Have you ever wondered how heating an egg white turns that uncooked clear goo into an opaque gel? Well, that transparent goo is made of mostly water a...
• 10.【英语时差8,16】火—人类最重要的工具之一（下）
• A fire needs oxygen and some kind of fuel. This fuelwhe the r its candle wax, wood, or gasolineusually contains big molecules that have carbon atoms i...