他 / 独自 / 挑战 / 强敌 / 勇气可嘉 / 但 / 还 / 需 / 谨慎

他独自挑战强敌，勇气可嘉，但还需谨慎。

He challenged a strong opponent alone; his courage is praiseworthy, but he still needs to be cautious.