But at the end, sometimes I feel very tired, heavy and sluggish.
但是，最后我时常感到困倦、昏沉和迟钝。
Sometimes I feel very tired than before, and I can keep in good mood.
有时候我会感觉比以前更累，但是我能保持心情愉快。
Sometimes I feel very (more) tired than before, and I can keep in good mood.
有时候我会感觉比以前更累，但是我能保持心情愉快。
Sometimes I feel very (more) tired than before, and I can keep in good mood.
有时候我会感觉比以前更累，但是我能保持心情愉快。
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