文章列表

• 1.【英语时差8,16】自制电话（上）
• Kids these days have so many electronic toys its possible to grow up without ever discovering the best toy in the world the tin can telephone. Moms an...
• 2.【英语时差8,16】眼见
• Don: Say you're looking at an object on a table in front of you. How long do you think your eyeballs stay in one position? Ya?l: You mean, how long be...
• 3.【英语时差8,16】陨星（下）
• But theres another reason. Remember that the earth doesnt sit still in space: its orbiting the sun at 18.5 miles per second. Meteors that are coming t...
• 4.【英语时差8,16】尾巴吱吱叫
• Don: [WHISTLING A BIRDSONG-LIKE TUNE] Ya?l: Nice tune Don, but can you whistle with your tail like an Anna's hummingbird? D: Hummingbirds can whistle ...
• 5.【英语时差8,16】陨星（上）
• Youre out on a clear, starry night with your best friend, looking for shooting stars. Look, theres one! your friend shouts. But by the time you look, ...
• 6.【英语时差8,16】耗油卡车（下）
• Here's why. A closed tailgate sets up a bubble of air that slowly circulates in the bed of the truck. Air coming over the cab of the truck treats the ...
• 7.【英语时差8,16】耗油卡车（上）
• Many a bet has been made, and many a friendly, and not-so-friendly, argument has been waged over whether you get better gas mileage in a pickup truck ...
• 8.【英语时差8,16】大坳
• Last time we imagined a tunnel through the center of the earth. If such a thing existed, you could step into one end, fall all the way to the other si...
• 9.【英语时差8,16】地洞
• Did you ever dream of digging a hole so deep it came out the other side of the earth? Let's play that game again, using a little physics. First we hav...
• 10.【英语时差8,16】荡秋千
• Sit on a swing, let someone push you, and away you go. But what happens if the person who pushed you walks away, and you want to swing faster and high...