That "negative" character means that the stabilizing power of contract does not impede productive flexibility.
“消极”的特征意味着契约的稳定力量不会妨碍到生产的灵活性。
2
Ancient people used it to shorten productive cycle, keep special character of species and expand reproduce coefficient.
古人主要将嫁接技法应用在缩短生产周期，保持物种特异性状和扩大繁殖系数上；
3
The paper focused on cultural character , pathogenic differentiation and vegetative compatibility of 35 strains from the main cotton productive regions in Xinjiang and 5 standard strains .