During seed production in hybrid rice, preharvest sprouting is one of the main restricting factors for yield and quality.
在杂交水稻制种生产上，穗上芽的发生成为制约制种产量和品质的主要因素之一。
So, rare information becomes one of the main factors of restricting the rural economic growth.
因此，信息稀缺、信息不足成为制约农村经济增长的主要因素之一。
The results indicated that the lower income, worse financial condition, and bad quality of hospital services are main factors restricting the aged to seek medical services.
结果显示：老年人收入低，经济状况差导致的医疗服务购买力低和医院服务质量差是制约老年人就诊的重要因素。
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