“脱壳”源于动物生长的自然规律。如:知了在生长过程中需要脱去一层坚硬的外壳,脱壳之后变成知了。正是因为它脱掉了坚硬的外壳,才有知了的嘶鸣,从而走向成熟。再如螃蟹在生长过程中也需要脱去坚硬的外壳,而后进入新的生长期,以至完美发育成熟。很多种动物都是从壳体中脱颖而出的。“脱壳”成为部分动物生长过程中的必然规律。 “Shelling ” from the natural law of animal growth. Such as: Know in the growth process need to take off a hard shell, after shelling became known. It is because it took off the hard shell, only know the neighing, and thus mature. Another example is the crab in the growth process also need to take off the hard shell, and then into the new growing season, and even perfect development and maturity. Many kinds of animals stand out from the shell. “Shelling ” has become a necessary law in the growth of some animals.