rubbish is hidden behind walls. Garbage cans are often of little use, making cleaners must rush all day long and also by night to clean the problems are becoming more and more serious a
The development of science and technology bring about both positive and negative effects to us. We must eliminate the positive effects to the least extent. 可以自己删减 在提供一篇翻译的: 现代科技使生活更加便捷(Modern
Materials science or materials engineering is an interdisciplinary field involving the properties of matter and its applications to various areas of science and engineering. This science investigates the relationship between the
Yun云2870
