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破折号比逗号分隔作用强，但它不及冒号正式，也不如括号严谨。例如：
His first thought on getting out of bed—if he had any thought at all—was to get back in again.
他起床时的第一个念头——如果他产生了任何念头的话——就是再回到床上去。
The rear axle began to make a noise—a grinding, chattering, teeth-gritting rasp.
后车轴开始发出噪音——一种吱吱嘎嘎、咔咔嗒嗒、磨牙般的刺耳响声。
The increasing reluctance of the sun to rise, the extra nip in the breeze, the patter of shed leaves dropping—all the evidences of all drifting into winter were clearer each day.
太阳越发姗姗来迟，微风都带着刺骨寒意，树叶啪嗒啪嗒地飘落——所有冬天迫近的征象都日益明显。
只在其他常用标点不足以满足需求时，才使用破折号。例如：
