每日即兴英文演讲 - What if the planes were never invented? 02:54 每日即兴英文演讲 - Who do you love and what are you doing about it? 02:29 每日即兴英文演讲Describe some of the tools you use in your job 04:47 每日即兴英文演讲What motivates you to do your best on the job? 05:...
Planes are an engineering masterpiece. Since they were invented, they have made the world a better place. Like never before, we can travel to almost every corner of the world within hours.【1】 The only time they land is when they need to get passengers on board or go through regular ...
Planes are an engineering masterpiece. Since they were invented, they have made the world a better place. Like never before, we can travel to almost every corner of the world within hours.【1】 The only time they land is when they need to get passengers on board or go through regular ...
Bikes, cars, trains and planes are all machines. They help us to travel faster than on foot.The computer is a wonderful machine. It was invented not long ago. It not only stores(贮存) information (信息)but also stores numbers millions of times as fast as a scientist does.Let’s study...
Why did planes have 2 wings? Biplanes were the original aircraft design in aviation to provide a lightweight yet sturdy structure. Newer materials and designs are much stronger and can be built with one wing. ... Having two wings stacked on top of each other also meant thatthe wings have...
New discoveries are changing long-held views of the biggest, meanest, and most bizarre animals that ever flew.
A wingsuit BASE jumper just live-streamed his own death—marking the latest fatality in the sport’s deadliest year. We investigate why both highly experienced pilots and beginners are dying in this extreme activity.
After the airplane was invented, people lost interest in balloons. Planes were much faster and easier to control. But some people today still like to go up in balloons. High up in the balloon basket, they find quietness. They have wonderful view of the world below. 【1】The first kind ...
Planes are an engineering masterpiece. Since they were invented, they have made the world a better place. Like never before, we can travel to almost every corner of the world within hours. 1The only time they land is when they need to get passengers on board or go through regular checks...
Why do passengers in high altitude jet planes feel the sensation of weight while passengers in an orbiting space vehicle, such as a space shuttle, do not? Why does an angle move with the Earth's magnetic field? Why don't we have a way to model gravity? Why...