首先告诉大家,我的论坛、博客、选课三大板块都开起来了(虽说选课还在完善,但这不重要),有时间可以去逛逛哈!(都在此网站主页)
Let's Beggggggggin!
★ First——invented machines
Event :Thousands of years ago,people invented machines.
Reason :It's hard to do it by manpower alone.
✰ Second——Levers
Event :People invented Levers.
Reason :Stop the beast in the night.
Result :At that time, people's work became easier and the lever became a kind of machinery.
Third——Rollers
Events :People began to move heavy objects with rollers.
Reason :People find it easier to move heavy objects with rollers.
Fourth——Ramps
Events :The Egyptians built pyramids with ramps.
Reason :None.
Result :Today, ramps are used in many places.
Fifth(Last)——Screws
Events :People(Who is he/she?)invented the screws.
Reason :We use it to fix(除了维修,还有固定的意思) sonething.
I think he is a genius!
Last(Real)
Today, we learned the development of machinery.Let's sort out its development:
OK, that's all the content of today's course.Thank you for all of you guys!
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ssyyyds