problems needing further research 需要进一步研究的问题
Finally, problems needing further research are put forward.
最后提出了需要进一步研究的问题。
In addition, some problems needing further research are offered.
另外提出了该方法中需要进一步研究的几个问题。
Low transformation ration, non-100% sterility, unstable sterility and difficult restoration of fertility are all existing problems needing further research and resolutions.
同时存在转化率低、不育度难以达到100%、不育性不稳定或育性恢复难等问题，有待于进一步研究与解决。
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