有这样一个实验:科学家把跳蚤放在桌子上,跳蚤迅速跳起,跳的高度均在其身高的100倍以上,堪称世界上跳得最高的动物。后来,科学家在跳蚤的头上罩上一个玻璃罩,再让它跳,这一次,跳蚤触到了玻璃罩。连续多次跳,跳蚤都会触到玻璃罩,最后,跳蚤终于改变了起跳高度以适应环境,每次跳跃总保持在罩顶以下高度。接下来,逐渐改变玻璃罩的高度,跳蚤都在碰壁后主动改 There is such an experiment: the scientists put the fleas on the table, fleas jump quickly, the height of the jump are more than 100 times its height, 堪称 the world’s highest skipping animals. Later, the scientist put a glass cover over the flea’s head and let it jump, this time, the flea touched the glass cover. After many consecutive jumps, the fleas touch the glass cover. Finally, the flea has finally changed the height of the take-off to adapt to the environment. Each jump always stays below the top of the cover. Next, gradually change the height of the glass cover, fleas in the wall after the initiative to change