The urban homeless are often in desperate need of sustenance.
城市里无家可归的
需要食物来
持
命。
存, 
道;计,谋道;
给量;The urban homeless are often in desperate need of sustenance.
城市里无家可归的需要食物来持命。
He gave money for the sustenance of a poor family.
他把钱给一穷家持活。
The earth brings forth large crops every year for the sustenance of man and beast.
大地每年产出大量的农作物,供畜食用。
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