更糟的是，阿军已精疲力竭，他们在前线得不到轮换：其参军后已连续不断地战斗了三年。
Worse, Afghan battalions are exhausted. They do not rotate out of the front line: soldiers fight without a break for the three years they are enlisted.
拎手提包或公文包时，应该不时地两边轮换着拎，避免让身体的一侧负担过重。
When carrying a bag or briefcase, switch sides frequently to avoid placing the bulk of weight on only one side of your body.
他兴奋地两只脚轮换着单脚跳。
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