•During this freezing weather, the food put out by householders is the only form of sustenance that the birds have.在这种严寒的天气里，住户放在外面的食物成了鸟儿唯一的粮食。

•A stick of celery does not provide much sustenance.一把芹菜提供不了多少营养。

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•When her husband died, she drew sustenance from /she found sustenance in her religious beliefs.丈夫死后，她从宗教信仰上寻求精神寄托。