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。
The results showed that main factors were artificial breeding skill, cost, ration and feeding skill, labor difficulty, live beef market, butcher skill, etc.
调查结果表明，主要的影响因素有：人工授精技术、推广经费问题、饲料与饲养管理技术、肉牛销售与市场、肉牛屠宰加工技术等等。
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