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。
2
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。
3
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.