单词：cotans
['kəutæn]
n.
=cotangent
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He then looked at the region where the Rosetans lived. 接着，他又把思路集中在罗赛托人生活的这块区域。 Was it possible that there was something about living in the foothills of eastern Pennsylvania that was good for their health
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This happened more than fifty years ago, 虽然时间已经过去了50多年， but Bruhn still had a sense of amazement in his voice, as he described what they found. 但一说起这次发现，布鲁恩的语调中依旧透露出惊奇不已的感情
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Good News: Earth's Ozone Hole is Healing 好消息:地球臭氧层空洞正在恢复 There is big news about the environment: Scientists say a hole in Earths protective ozone layer is starting to heal. 一则关于环境的重磅新闻来袭：科学家
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There's no reliable blood or tissue test, partly because gluten sensitivity isn't a single disease, 现今没有可靠的血液测试或组织测试来确诊，部分原因是麸质敏感不是单一疾病， and has a number of different possible ca
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Todd: So, Rebecca, talking about your country, I hear that skin cancer is a serious problem in Australia. Rebecca: Yeah, it is. I think our environment is the cause of it in a way because we do have the beautiful beaches that you always want to go ou
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Todd: So, Rebecca, talking about your country, I hear that skin cancer is a serious problem in Australia? Rebecca: Yeah, it is. I think our environment is the cause of it in a way because we do have the beautiful beaches that you always want to go ou
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