4 th generation language 第四代语言
4 th generation fighters 四代战斗机
4-th generation quinolones 第四代喹诺酮
Method:Smooth muscle cell from human umbilical artery was cultured in vitro. 4~5 th generation were took for use.
方法：人脐带动脉平滑肌细胞体外原代培养，传至4～ 5代用于实验。
As a key technology for 4 ~ (th) Generation wireless mobile communication system, OFDM has drawn more and more attention in communication fields.
作为第四代移动通信的核心技术，正交频分复用(OFDM)系统愈来愈引起业界的普遍关注。
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