serious
[形容词]
(of a person) quiet, thoughtful, and showing little emotion in one's manner or appearance

认真, 严肃
active
[形容词]
(of a person) doing many things with a lot of energy

活跃的, 积极的
Ex: active kids played outside all afternoon without getting tired .
unimportant
[形容词]
having no value or significance

不重要的, 微不足道的
Ex: unimportant details of the story did n't detract from its main message .
broken
[形容词]
(of a thing) physically divided into pieces, because of being damaged, dropped, etc.

破碎的, 坏掉的
usual
[形容词]
conforming to what is generally anticipated or considered typical

通常的, 习惯的
Ex: They followed usual protocol during the meeting .

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