Sleeping for six hours produced less forgetting than four hours or less of prior sleep.
相比于四小时或者更少的睡眠时间，六小时睡眠造成的遗忘程度要轻一些。
Take short showers lasting about four or six minutes instead of a bath.
洗澡时冲四到六分钟的澡不再用盆浴。
Take short showers lasting about four or six minutes instead of a bath.
洗澡时冲四到六分钟的澡不再用盆浴。
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