Most people perform best at mentally challenging tasks between 10.00 and noon.
大多数人对于精神上的挑战任务在十点和下午表现最佳。
Sometimes we engage ourselves with challenging tasks and feel upset if something is wrong.
有时候我们总是忙碌于有挑战的任务，如果出错的话，就会感觉郁闷。
Sometimess we engage ourselves with challenging tasks and feel upset if something is wrong.
有时候我们总是忙碌于有挑战的任务，如果出错的话，就会感觉郁闷。
Sometimess we engage ourselves with challenging tasks and feel upset if something is wrong.
有时候我们总是忙碌于有挑战的任务，如果出错的话，就会感觉郁闷。
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