This article analyzes reasons for constant troubles in operation, puts forward trouble- shooting methods, and introduces corresponding normal maintenance.
分析了在使用过程中出现的常见故障原因，并提出了解决办法，介绍了日常使用时的正常维护与保养。
Sufferers have trouble concentrating on any task unless they receive constant feedback, stimulation and reward.
除非得到经常反馈、刺激、奖励，童患者很难专心致志于任何任务。
He is so weak that he has trouble getting into and out of the car, and his wheelchair is his constant companion. His appetite is gone.
他虚弱的已经无法自如地上下车，而且他的轮椅已经成了他最好的伙伴。
He is so weak that he has trouble getting into and out of the car, and his wheelchair is his constant companion. His appetite is gone.
他虚弱的已经无法自如地上下车，而且他的轮椅已经成了他最好的伙伴。
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