单词:galvanizing electrolytic
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Sunday marks the first Space Day of China. Chinese President Xi Jinping has encouraged the country's space scientists and engineers to usher in a new chapter in aerospace development. Xi Jinping asked them to seize the strategic opportunity, and keep
发表于:2019-03-12 / 阅读(267) / 评论(0)
cctv9英语新闻2016年