to sit with a straight back坐直
to stay awake and not go to bed although it is late迟睡,熬夜
informal to show interest or surprise感兴趣;惊讶
a type of exercise in which someone sits up from a lying position, designed to make the abdominal muscles stronger仰卧起坐
See also: sit (sb) up
See also: sit (sb) up
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