Nature is what we humans depend upon for survival.

大自然是人类赖以生存的有限空间。

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Fortunately, there are dedicated activists like Wu Lihong to continue the fight for clean water in China, which millions depend upon for their health and livelihoods.

幸运的是，还有专门的分子如吴立宏继续在中国的清洁水的斗争，使数以百万计的取决于他们的健康和生计。

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When the children are young and depend upon the family for financial needs, families with modest incomes have difficulty providing enough life insurance to protect the mother and the children.

当孩子们年幼时，需要依靠家庭满足财务需求，而收入不高的家庭很难购买足够的人寿保险来保护母亲和孩子。

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And while most Afghans do not like having foreign troops in their country (and increasing numbers are fighting them), many know that they will have to depend upon them for some time yet.

BBC: Afghans sceptical about fresh troops

Harvard University is a private institution that does not depend upon government funds for its operation or tuition.

FORBES: Colleges And Universities Should Operate More Like Businesses

Then they take care of people who are often desperately ill, and who depend upon their expertise for help.

FORBES: Will the Sequester Cause Oncologists to Lose Money Prescribing Chemotherapy?