to crush hard food loudly between the teeth, or to make a sound as if something is being crushed or broken嘎吱地咬嚼;嘎吱作响
[ C usually singular ] the sound of hard food being crushed between the teeth, or like something being crushed or broken嘎吱的声音
a difficult situation that forces you to make a decision or do something严峻的形势;紧要关头;需要作出艰难抉择的时刻
[ C usually plural ] an exercise in which you lie on your back on the floor with your knees bent and your feet flat on the floor, and then raise your head and shoulders增强腹肌的锻炼;仰卧起坐
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