One conservationist who recently went looking for a rare poisonous bird in an unexplored region had to take along a local shaman as a guide, a measure of Papua New Guinea's splendid isolation.

一位最近进入未开发地区寻找一种罕见有毒鸟类的环保主义者不得不带上一位当地萨满作为向导。萨满巫师也是当地与世隔绝的标志之一。

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The early Romans used the moon as a guide to measure the months.

早期的罗马人利用月亮的圆缺和位置作为向导来推测月份。

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Engineers can also send energy pulses through the earth between the Wells and measure how fast these travel, as a guide to how the carbon dioxide is spreading.

工程师们也可以通过从地球内部和探井中发送的能量波来监测液体的渗入，并控制二氧化碳的分布。

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And the planned introduction, this April, of a nationwide value-added tax levied by India's state governments is, if China's experience in the 1990s is a guide, another hopeful measure.

ECONOMIST: India and China

If there is no objective measure to guide our decisions, if there are no facts that can be counted among our arguments, the weight of our argument is diminished.

FORBES: The Death of the Fact

From a total factor productivity standpoint, a guide post used by economists to measure capital investment in an economy, Brazil grew 1.2 percent over the last 8 years ending 2010, while Mexico grew just 0.1 percent.

FORBES: Can Mexico Overtake Brazil By 2022?