A scientist once performed such an experiment: he put a lot of fleas into a wide mouth bottle, which he covered with a piece of transparent glass.
一位科学家做过这样一个实验：把许多跳蚤放到一个广口瓶里，瓶口用透明玻璃盖住。
The sword that his father carried into more battles than a brachet has fleas!
那把剑，他的父亲曾无数次佩带到战场上，次数比一只猎犬身上的跳蚤还要多！
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