单词:Lignin(e)
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Can Wood Be Stronger Than Steel? Researchers say they have created a new super-material in the laboratory. They say it is stronger, lighter and costs less than steel. 研究人员表示,他们在实验室中造出了一种新的超级材料。他们称
发表于:2018-12-08 / 阅读(80) / 评论(0)
2018年VOA慢速英语(三)月