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。
Berea College in Kentucky offers laptops to all of its incoming students. And if your computer breaks during matriculation, the university will repair it free of charge.
肯塔基州的伯里亚学院为所有新生提供笔记本电脑，如果电脑在入学考试期间坏了，学校还会免费维修。
Fake calls is an application which with you can fake incoming phone calls, no actual call is made thus the calls are free of charge.
假冒电话是一个应用程序，你可以用假进料电话，没有任何实际的电话是如此的电话都是免费的。
Berea College in Kentucky offers laptops to all of its incoming students. And if your computer breaks during matriculation the university will repair it free of charge.
肯塔基州的伯里亚学院为所有新生提供笔记本电脑，如果电脑在入学考试期间坏了，学校还会免费维修。
免费代收传真。
免费代收传真。
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