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1.armed services 武装部队；陆海空三军
His conduct was totally unbecoming to an officer in the British armed services.
作为一名英军军官，他的行为极不得体。
2.be short for 是…的简称；是…的缩写
e vehicle Antilock Braking System ( be short for ABS) has been widely applied on the vehicles, in order to improve the safety.
为提高汽车行驶安全性，制动防抱死系统（简称ABS）在汽车上得到了广泛应用。
3.drop out of 退出;退去
Research suggests that children whose parents split up are more likely to drop out of high school
研究表明，父母离异的孩子更容易从中学中途退学。
