Used in formal or written contexts to express prohibition or advice, similar to 不要 bù​yào or 别 bié.

to fail to remember; to overlook or neglect

national humiliation or shame. It often refers to historic events where a nation's dignity was violated, particularly Japanese aggression toward China in the 1930s and 40s starting with the 九一八事变 jiǔ​yī​bā​shì​biàn.