结果：踝关节扭伤发生的危险因素为吸烟和入伍前损伤史，OR值为2.00和3.17，保护因素为入伍前体育竞赛史，OR值为0.39。
Results:The risk factors were smoking and previous injury with OR 2.00 and 3.17 respectively. History of match was the protective factor with OR 0.39.
他们为避免被强征入伍而离开了自己的村庄。
They left their villages to evade being press-ganged into the army.
这青年已入伍，但他父母花钱为他免去了兵役。
The boy had enlisted, but his parents were able to buy him out.
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