... breeding cycle 繁育周期; 繁殖周期 breeding difficulty 繁殖障碍 breeding disturbance 繁育障碍 ...
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He had much difficulty in breeding tropical plants in his garden.
他费了很大的劲在花园里培育热带植物。
Conventional intercrossing of peach have many shortcomings, which bring biggish difficulty to breeding work.
桃的常规杂交育种存在很多弊端，给育种工作带来较大的困难。
Especially, what self-crossing is highly no appetency makes easy lose of good single genotype, which propagatation and conservation of good varieties breeding brings great difficulty.
特别是自交高度不亲和性，往往使得优良单株基因型很容易丢失，给优良品种选育材料的繁殖和保存带来了极大困难。
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