upgrade

/'ʌpgreid/

n. 上坡, 升级, 上升；adv. 往上；vt. 使升级, 提升, 改良品种；vi. 升级；[计] 升级

英释：n. software that provides better performance than an earlier version did

词形：过去式 upgraded；过去分词 upgraded；现在分词 upgrading；三单 upgrades；复数 upgrades