题目内容
a. (of a person) not happy or smiling; (of a religious ceremony or formal occasion) performed in a serious way
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a. not having much distance between the top or surface and the bottom; (of a person, an idea, a comment, etc.) not showing serious thought, feelings, etc. about sth.
n. a thing that is added to sth. else to improve or complete it; vt. to add sth.to sth.in order to improve it or make it more complete
a. not moving, changing or developing
a. happening or done quickly and immediately; doing sth. quickly; moving very quickly; able to move very quickly
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