close breeding的用法和樣例：
例句
- Research progress on cross breeding of Chinese fir was summarized in this paper and the primary insufficiency was analyzed.
摘要概述了我國杉木雜交育種研究進展，分析了杉木雜交育種存在的主要問題及其對策。 - The index of drought resistance lies in yield increase and drought resistance.The hybrid breeding is the main measure for mungbean breeding.
抗旱指數是抗旱性和豐產性的有機結合，雜交育種是提高豐產性的關鍵。
