Jack is a diligent student. He devoted all his energy and energy to writing a paper on waste utilization. After several months of hard work, he successfully completed the thesis. He was very grateful for my suggestions on the outline of the paper, because I told him that things that can't be taken for granted as rubbish, such as newspapers, magazines, old computers and mobile phones, can actually be recycled and reused in one way or another<br>
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