相对不育：只具有生育能力，但怀孕成功可能性较低，受孕成功水平低于临界值。
假设IVF这门科学还处在相对幼稚的时期，第二代不育的问题是一个非常让人感兴趣的领域，涉及的问题可能只有在未来几年才会清楚。
This question of second-generation infertility is an area of particular interest, and given the relative infancy of the science of IVF, it is something that will become clear only in years to come.
参试不育系包颈率都较高，而闭颖率相对较低。
All the P(T)GMS have higher wrapround spikelet rate and relatively lower indehiscent spikelet rate.
参试不育系包颈率都较高，而闭颖率相对较低。
All the P(T)GMS have higher wrapround spikelet rates and relatively lower indehiscent spikelet rates.
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