1 sentence

1. 升级守卫塔，以增加他们的火力和加强你的防御。

   shēng jí shǒu​wèi tǎ, yǐ zēng​jiā tā​men de huǒ​lì hé jiā​qiáng nǐ de fáng​yù.

   Upgrade guard towers to increase their firepower and strengthen your defenses.

   Source: CCMatrix