跳蚤,只有仅仅几毫米大,却能跳得极高、极远,根据百科全书的资料显示,如果人腿的跳跃能力与之相当,则一跃可越过五个街区。有人做了一项有趣的试验:将一只跳蚤放置在玻璃瓶子里,限制它的跳跃能力。在接下来的一段日子里,渐次更换瓶子,瓶子越换越小,跳蚤活动的空间愈缩愈小,跳高和跳远的能力也全面受到了压抑,最后,关在一个 Fleas, which are only a few millimeters across, can jump extremely high and far away. According to encyclopedias, if the jumping ability of a human leg is comparable, it can leap over five blocks. Someone did an interesting experiment: Place a fleas in a glass bottle to limit its ability to jump. Over the next few days, as bottles were gradually changed, the bottles became smaller and smaller, the space for fleas became smaller, the ability to jump high and jump longer was suppressed, and finally, they were all in one place.