Under these conditions, selection for secondary traits, such as anthesis silking interval and ear per plant, may increase the selection efficiency.
在干旱条件下，寻找遗传力高且与产量高度相关的第二类性状，构建选择指标，可提高耐旱选择效率。
Statistical analysis shows that the economical importances of lactation, beef and secondary traits in this population are in the proportion of 2 : 1 : 2.
经统计分析表明，北京奶牛群的乳用、肉用和次级性状经济重要性之比为2：1：2。
Secondary vocational education is characterized by local traits, it relies on the local economy and also services to the local economy.
中等职业教育具有浓厚的地方性特点，依托于地区经济，同时又服务于地方经济。
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