As everyone in this class should know, we usually look at the grain type within sandstone, meaning the actual particles in the sandstone, to determine where it came from.

上过这门课的同学都应该知道，我们一般会通过观察砂岩中的颗粒类型，也就是砂岩中的实际颗粒，来确定它的来源。

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In good times, most of the economy's impetus came from within so it was less exposed to trouble from without.

经济环境好的时候，法国经济大部分的推动力来自国内，所以受外部问题的影响也就较小。

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In good times, most of the economy's impetus came from within so it was less exposed to trouble from without.Another factor is the French government.

经济环境好的时候，法国经济大部分的推动力来自国内，所以受外部问题的影响也就较小。

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"It came to me from a source within the U.S. government, " is all Van Poppel will say.

FORBES: Media

The president triumphed with the passage of the North American Free Trade Agreement, but it came only over loud protest from within his party, and with near-unanimous support of congressional Republicans.

CNN: Bill Clinton

In good times, most of the economy's impetus came from within so it was less exposed to trouble from without.

ECONOMIST: The euro-area economy