Analogous to a snow avalanche on a steep mountain slope, an incoming light pulse initially frees just a few charge carriers which in turn free others until the original signal is amplified many times.

像陡峭山坡上的雪崩一样，一束入射光的脉冲最初仅仅释放少数的电荷载子(charge carrier)，这些电荷载子再轮流释放其他的载子，直到原始信号被放大很多次。

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This disaster is one of the most devastating examples of a very common event: an avalanche of snow or ice.

这场灾难是冰雪雪崩这一常见事件中最具破坏性的例子之一。

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The kind of avalanche that destroys trees, cars, buses, even houses! Tens of thousands of tons of snow were coming straight down the mountain behind me.

这种雪崩会摧毁树木、汽车、公共汽车，甚至是房屋！成千上万吨的雪在我身后的山上直冲下来。

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The New Jersey governor is under attack for remaining on his family vacation in Florida while his home state digs out from an avalanche of snow.

FORBES: Leave Chris Christie Alone!

He said the men, who had started their climb at 0930BST, had been about two-thirds of the way to the summit when the snow slope started to avalanche.

BBC: Lucky escape after mountain fall

The climbers were on a steep slope where there was snow, which meant an avalanche was possible, but there was no reason to suspect it would happen then, he told CNN affiliate BFM TV.

CNN: 9 dead in France avalanche, police say