英语语法不懂Themosteconomicalagetocaptureanelephantfortrainingisbetweenfifteenandtwentyyears这里的tocaptureanelephantfortraining做什么成分啊作状语的话是什么状语啊翻译就不用了

　　英语语法不懂

　　Themosteconomicalagetocaptureanelephantfortrainingisbetweenfifteenandtwentyyears这里的tocaptureanelephantfortraining做什么成分啊作状语的话是什么状语啊翻译就不用了