What are the best and the most useful inventions of mankind in the 20th and 21st centuries?
학생이 쓴 원문
강사 첨삭
Hi there [이름]! I think smartphones changed our lives a lot. You did great in answering today\'s homework! But please be mindful of your spelling and capitalization. See you! ~T. Elisha
the cellphone is the best and the most useful inventions of mankind at that time.
>> The cellphone is the best and the most useful invention of mankind.
after smartphne was released, we can contact beyond the world without international calling just using by application.
>> After smartphones were released, we can contact anybody in the world just by using an application.
and also we can search everything whenever we want.
>> We can also search about anything whenever we want.
even the owner is getting the phone, when he disappears we can find him too.
>> Even when the owner lost his own smartphone, he can now find it too.
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