这些绵羊和山羊的杂交品种能够适应恶劣的气候条件。

These sheep and goat ___crossbreeds can adapt to harsh climate conditions.

科学家们通过杂交不同品种的玫瑰培育出了更耐寒的新品种。

Scientists created hardier rose varieties by producing ___crossbreeds of different species.