lower one's guard 丧失警惕 ; 轻视而漫不经心
to lower one's guard 掉以轻心
And my classmates' grade is very good, so I don't lower one's guard.
并且我的同学等级是非常好,因此我不降低你的卫兵。
youdao
应用推荐
模块上移
模块下移
不移动