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重点是学习这个句子中的动词词组go off,有两个主要的含义:爆炸(to undergo detonation; explode);响起(to make a noise; sound)。因为第一个含义,所以这个“响起”包含一种“响起,从而突然打破某种状态”的意义。再如,
I HEARD THE ALARM GO OFF FROM MY BED.WE SHOULD FOCUS ON THE PHRASE "GO OFF"SPECIALLY,MEANS THE EXPLODE FROM SOMEWHERE OR MAKE A NOISE.FOR INS 2 THE FIRST MEANINGS,THE SIREN WENT OFF AT NOON.THATS ALL