英语语法分析

Rubber trees intercropping with Alpinia villosum was the best to improve soil fertility.

以橡胶间种砂仁对土壤肥力的提高最为理想。

CONCLUSION This study offers theoretic basis for utilization of Alpinia zerumbet (Pers. ) Burtt et Smith.

结论：本研究为开发利用艳山姜资源提供了依据。

Alpinia officinarum solvent extracts had better repellent effect, and the average repellent rate were above 80%.

就驱避作用而言，高良姜的溶剂提取物对烟草甲成虫驱避作用较强，其平均驱避率达到了80％以上。