upgrading training

upgrading training 基本解释

升级培训

重点词汇

upgrading v. 升级；提高品位（upgrade的现在分词）

training n. 训练；培养；（枪炮，摄影机等的）瞄准；整枝法 v. 训练，培养( train的现在分词)；教育；瞄准；整枝