在人力不足的情况下，新加坡正转而使用机器人来减少公园巡逻所需的人力，并提醒人们他们可能给自己和别人带来风险。
Without enough manpower, Singapore is turning to robotics to reduce the manpower required for park patrols and remind people about the risks they may be putting themselves and others in.
使我们烦恼的是人力不足。
失败的三个原因是：计划不周、人力不足、材料短缺。
Three causes have been given for the failure: poor planning, insufficient manpower, and the shortage of material.
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