A scientist once performed such an experiment: he put a lot of fleas into a widemouthbottle, 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。
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A good way to accomplish this is to fill a wide-mouthed bottle with hot water nearly to the brim, and press affected part of hand tightly against mouth of the bottle.
New Mom wide caliber streamlined glass milk bottlebottlemouthwide, and in tone when milk spilled milk powder not easily with characteristics, and clean rise is also very convenient.