关于学生学习制作演讲的英语作业 Hi,everyone.As we all know,many great inventions have brought great changes to our life.I think we students can also invent something. Today I'm glad to be here to talk about what I'd like to invent-a chair that's good for students'health.It will be made of wood.There will be two sensors in it--one on the seat,and the other on the back of the chair.When the student doesn't sit straight,the chair will remind him.If he sits on the chair for over one hour,it will make a noise.It won't stop until the student stands up and leaves. It will be a useful invention,won't it? Thank you! 本文来源：https://www.wddqw.com/doc/a6e6235e4bd7c1c708a1284ac850ad02de8007ea.html