In situ combustion is an important method for thermal recovery of viscous oil reservoir, the key of success is sand face ignition.

火烧油层是热力开采稠油油藏的重要方法，其成功的关键是油层点火。

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In one instance, scientists found that hundreds of cubic yards of sand had avalanched down the face of a dune.

在一个实例中，科学家们发现大量立方码的沙粒从沙丘的表面崩落。

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Now there was Herto. As the broad, heavy-browed male skull emerged from its matrix of sand, it proved the perfect face for the out of Africa theory.

但在赫托村的发现提供了最直接的证据，这具头骨来自于一位宽额粗眉的男性，它的出土有力证明了人类起源于非洲的理论。

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"Take your head out of the sand and face up to reality because it will hit you between the eyes like a steam train if you don't wake up to it, " he said.

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And while it used to require a certain set of characteristics to thrive as a bully, the internet makes it simple for almost anyone to graduate from cowering weakling to kicking virtual sand in the face of friends and strangers in no time.

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As in the old Charles Atlas ads, the 97-pound weakling eventually gets tired of having sand kicked in his face, heads off to the gym and becomes just as muscled as the bully.

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