单词：porphyrin ring
porphyrin ring的用法和样例：
例句
- The chief differences between chlorophyll and heme are the presence of a magnesium atom in the center of the porphyrin ring.叶绿素和血红素之间的主要的差别为在卟啉环中心存在一个镁原子。
单词：porphyrin ring 相关文章
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今天我们要学的词组是ring。 Ring是戒指，耳环，也指从事非法活动的集团、团伙。比如贩毒集团 -- drug ring，出售儿童色情录像的团伙 -- child pornography ring。 有报道说， 奥地利政府侦破了一个在
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Ring A Ring Of Roses a ring of roses a pocket full of posies (hot-sha hat-sha all fall down)* ring a ring of roses a pocket full of posies (hot-sha hat-sha all fall down)* the king has sent his daughter to fetch a pail of water (hot-sha hat-sha all f
优美儿童英语歌曲
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美国习惯用语
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英文语法词汇
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歌词如下： Ring,ring,ring the bells, Ring them loud and clear. To tell the children everywhere, That Christmastime is here. Ring,ring,ring the bells, Ring them loud and clear. To tell the children everywhere, That Christmastime is here.
英语儿歌274首
Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文，请发贴到 听力原文收集区 ，您将会获得10到30积分的奖励! Thank you！
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今天学的词组是throw one's hat in the ring。这个词组的字面意思是把帽子扔进拳击场。据说在19世纪的拳击比赛中，有人要和拳击手较量，就把帽子扔进拳击场里 -- throw his hat in the ring。后来把帽子
学个词