Sheep is the faithful companion of human and an indispensable source of life.

羊自古以来是人类的忠实伴侣和不可或缺的生活来源。

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First published in 1927, the charts remain an indispensable source for researchers.

该图表从1927年初次发表到现在仍然是研究者不可或确的资料。

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Various mews media can be an indispensable source of information for the vast majority of people.

各种新闻传媒可以是大多数人获得信息的不可缺少的源泉。

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For journalists trying to disentangle the claims and counter-claims of politicians against hourly and daily deadlines, it has become an indispensable source of anti-spin.

ECONOMIST: Policy watchdog