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- brown ring reaction 棕环试验
- The golden brown ring is a doughnut. 那枚金黄色的戒指是一个油炸圈饼.
- Experiment result of brown ring, diphenylamine and Kjeldahl method confirm that SN accelerate the esterification of BTCA with cellulose, and without consumption and character change itself in the whole reaction. 并且由棕色环、二苯胺和克氏定氮实验结果表明：硝酸钠在反应前后既没有消耗也没有发生性质的改变，只是在体系中起到了加速BTCA与纤维素酯化反应速率的作用。
- After it was mixed with epoxy resin,transition state was formed first.Then they got on with opening ring reactions according to bimolecular nucleophilic substitution mechanism(SN2). 它与环氧树脂混合后首先形成过渡状态，然后按双分子亲核取代(SN2)机理进行开环反应。
- Mr. Robert Brown was announced as the sponsor. 罗勃特·布朗先生被宣布为赞助人。
- She had the sapphire set in a gold ring. 她把那枚蓝宝石镶在金戒指上了。
- The diamond ring dazzled with brilliancy. 这只钻石戒指闪耀夺目。
- Do you know why Mr Brown has a heavy heart? 你知道为什么布朗先生心情不愉快吗？
- The girl was dressed in brown from top to toe. 那女孩从头到脚穿着一身棕色的衣服。
- Mrs Brown is known as a social climber. 布朗太太是有名的趋炎附势的人。
- This hen lays beautiful brown eggs. 这只母鸡下很漂亮的棕色蛋。
- The linnet is a small brown songbird. 红雀是一种棕色会叫的小鸟。
- She wears a diamond ring on her left hand. 她左手上戴着一枚钻石戒指。
- I wrap the book in brown paper before I mail it. 我先把书用牛皮纸包好，然後邮寄。
- Our family reunions are always three ring circus. 我家合家团聚的场面总是热闹非凡。
- Two brown loaves and one large white one, please. 请拿两个黑面包和一个大的白面包。
- Keywords phenylhydrazine carbonyl compounds close ring reaction application; 苯肼;羰基化合物;成环反应;应用;
- The book was wrapped up in brown paper. 书用棕色的纸包了起来。
- I am sorry-she's out. Can you ring again later? 对不起－她出去了。你过些时候再打电话来好吗？
- He has brown hair, and speaks small like a woman. 他长着棕色头发，说话轻声细语像个女人。
