单词：darkenings
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台湾籍旅美老师今天交给我们的句子是： Soft tissue, on the other hand, isn't as dense, and contains mostly lower atomic number elements, like carbon, hydrogen, and oxygen. So more of the X-rays penetrate tissues like lungs and muscles
发表于:2019-03-05 / 阅读(235) / 评论(0)
留美老师带你每日说英文
留美老师带你每日说英文