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
范文：It can be expected that there will be a breakthrough in life sceience and space science in the 21st century First， scientists will conquer incurable diseases through the transformation of genes
Science is both a body of knowledge and a process. In school, science may sometimes seem like a collection of isolated and static facts listed in a textbook, but that's only a small part of the story. Just as i
Good morning, everyone！Here, I'd like to introduce the music robot my father bought is small, so you can even carry it in your you connect it to the Internet and speak to it
The development of science and technology makes our life more comfortable and convenient. However, scientists have created many problems, which are not easy to be resolved, such as air pollution, the deterioration of enviro
angellingabc
