英语语法分析

At present, the ethrel stimulated tapping system is a primary tapping system.

目前，乙烯刺激割胶制度是主要的割胶制度。

ABA and ethrel spray treatment sharply decreased the attachment of stem to the fruit.

ABA和乙稀利喷穗则使果柄的耐拉力明显降低。

The results showed that the enhancement effects on cell wall enzymes changed with ethrel concentrations.

结果表明：乙烯对各细胞壁酶活性的促进效应因乙烯利施用浓度不同而异。