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- The micronuclei were not observed in tetrad stage . 四分体阶段有微核。
- The microspores in tetrad stage showed tetrahedron structure. 小孢子四分体为四面体型。
- At tetrad stage, dyad, triad, tetrad with micronucleus and polyad appeared. 四分体时期还出现二分体、三分体、含微核的异常四分体及多分体。
- In tetrad stage, the structures of tapetal cells begin to dissociate. 四分体时期，绒毡层细胞内部结构开始解体。
- There were micronuclei and tetraspores of various types in the tetrad stage . 四分体阶段有微核和不同类型的四分孢子群。
- The exine deposition is initiated during the tetrad stage, and the intine formation begins at vacuolated microspore stage. 小孢子在四分体时期开始沉积花粉外壁，小孢子大液泡化时期开始沉积花粉内壁。
- The microspores in tetrad stage showed three arrangements, such as isobilateral tetrad, decussate tetrad, and tetrahedral tetrad. 四分体有3种类型: 左右对称型、四面体型、交叉型;
- The results showed that microsporogenesis could process normally and there was no difference in the tapetal cell between 8A and 8B lines before tetrad stage. 结果表明：不育系和保持系都能正常进行减数分裂，绒毡层细胞无明显差异，形成了正常的四分孢子。
- Organells including endoplasmic reticulum, mitochondria, plastids, dictyosome and sphaeroplassts are rich in microspore at meiosis and tetrad stages. 减数分裂和四分体时期，细胞处于明显的代谢活跃状态，细胞器丰富，主要有内质网、线粒体、质体、高尔基体和球状体；
- Tetrad stage of microsporogenesis in lily 小孢子发生的四分体阶段
- There are many spotlights on the stage. 舞台上有很多聚光灯。
- Please dim out the stage for the final scene. 请在最后一场即将开演时使舞台灯光转暗。
- The singer was led off the stage by the maestro. 歌唱家由那位著名的指挥领着离开了舞台。
- I always get the jitters before I go on stage. 我登台之前总是感到紧张。
- She did the first stage of the trip by train. 她行程的第一段是乘火车的。
- She's wanted to go on the stage from an early age. 她从小就想当演员。
- The singer got the bird when she came out on stage. 这位歌手一出现在舞台上人们便以嘘声嘲弄她。
- The disease is still in its primary stage. 这疾病仍然在初发阶段。
- Negotiations were at a crucial stage. 谈判正处于一个关键的阶段。
- The technique is still at the experimental stage. 这项技术正处于实验阶段。
