They wished they knew how to prevent their food supply from sometimes failing, and how they could rest when they were tired without risking starvation, be warmer, cooler, safer, in less pain.
人们希望知道 如何避免食物来源 不时的中断 如何在疲惫时得以充分休整 又不会因为停止劳作而断粮 如何创造更温暖，或更凉爽；更安全的环境 如何减轻痛苦