工人，为了干净的食堂和健康的食物而斗争。
世界上许多地区的人们仍不得不为争取足够的食物而斗争。
Vast sections of the world's population still have to struggle in order to get enough food to eat.
马尔萨斯提供了线索：人类得为食物供应而斗争，得解决生存的环境问题。
Malthus gave the clue: man had to struggle for his food supply and to cope with his environment.
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