Any problem as yet unsettled that tends to recur in your thoughts during the day is suitable subject.
当天的任何问题，只要是挥之不去、犹疑不定的，即是最好的应用题材。
Any problem as yet unsettled that tends to recur in your thoughts during the day is a suitable subject.
当天的任何问题，只要是挥之不去、犹疑不定的，即是最好的应用题材。
Any problem as yet unsettled that tends to recur in your thoughts during the day is a suitable subject.
当天的任何问题，只要是挥之不去、犹疑不定的，即是最好的应用题材。
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