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- Methods of structure modification of lead-compound piracetam,including acetamide side chain modified derivates,ring substituted derivates,and derivates lacking acetamide side chain,are summarized. 综述了对先导化合物吡拉西坦进行结构修饰的方法:乙酰胺侧链修饰衍生物、环修饰衍生物和非乙酰胺侧链衍生物法,并介绍了合成吡拉西坦类促智药的方法及其优缺点。
- 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。
- The coach substituted Smith for Jones. 教练让史密斯上场,换下了琼斯。
- Tom substituted for the injured player. 汤姆替换了那个受伤的运动员。
- She wears a diamond ring on her left hand. 她左手上戴着一枚钻石戒指。
- Our family reunions are always three ring circus. 我家合家团聚的场面总是热闹非凡。
- The understudy was substituted when the leading actor fell ill. 主角演员患病,由替角代替演出。
- 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?
- The boys and girls made a ring round us. 男孩和女孩围着我们站了一圈。
- Please ring for the attendant if you need anything. 如果需要什么,请按铃找服务员。
- The music was so loud it made my ears ring. 音乐的声音太大了,把我耳朵震得直响。
- The policeman felt that my story didn't ring true. 警察认为我讲的话听起来不可信。
- She wears a ring round her wrist. 她的手腕上戴着一只镯子。
- A striker was substituted for a midfield player in the last half-hour of play. 在比赛的最后30分钟里,一个中场运动员被一个强攻手替换了下去。
- Ring the correct answer with your pencil. 用铅笔圈出正确的答案。
- We substituted a red ball for blue to see if the baby would notice. 我们用红皮球换下了蓝皮球,看这婴儿会不会发觉。
- A pull on the rope will make the bell ring. 一拉绳子钟就响。
- Home-made parts are being substituted for imported ones. 国产零件取代进口零件。
- He have scarcely get home when the telephone ring. 他一回到家电话铃就响了起来。