三系杂交是指配制一个优良杂交种所需要的特定的三个系，包括不育系、保持系和恢复系必须配套才能使用的一种杂交方法。
对三系杂交棉今后的研究方向进行了展望。
The future work on CMS and its utilization in cotton are also discussed.
参试亲本配制的两系杂交组合在综合性状及单株产量上均不及三系杂交组合。
The twoine hybrids were inferior to the threeine ones with respect to most of the traits.
但现行的三系杂交水稻制种技术，自播种至收获完全依靠人工操作，工序繁杂。
Now the process of the hybrid seed production mainly relies on manual, the working procedure is very burdensome.
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