然而由于长期对湖羊的保护和开发利用不足，无计划引进外来绵羊与湖羊大量杂交，湖羊资源已经受到严重挑战。

However now, the protection of Hu sheep is facing a formidable situation because of long-term lack of exploitation and utilization as well as crossing with sheep out-of-town planlessly.

youdao

然而由于长期对湖羊的保护和开发利用不足，无计划引进外来绵羊与湖羊大量杂交，湖羊资源已经受到严重挑战。

However now, the protection of Hu sheep is facing a formidable situation because of long-term lack of exploitation and utilization as well as crossing with sheep out-of-town planlessly.

youdao