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中学《动物学》课本第158页上有这样一段话:“家鸽飞翔时,气囊除了协助肺完成呼吸作用外,还有减轻身体的比重,……的作用.”在此教材明确地提出了家鸽气囊的作用之一,是有助于减轻身体的比重.此提法同武汉大学、南京大学和北京师范大学合编的《普通动物学》中第351页上的提法相同.本人认为“气囊有减轻身体的比重作用”的提法不够准确,具体理由如下.
On page 158 of the Zoology textbook on secondary school, there is a passage like this: “In addition to assisting the lungs to complete respiration, the air bag also has the effect of reducing the body mass, ... in the flight of the pigeon.” Here, the text clearly states One of the effects of the pigeon’s airbag is to help reduce the body weight, which is the same as that on page 351 of “General Zoology” compiled by Wuhan University, Nanjing University and Beijing Normal University, and I think “The balloon has the effect of reducing the body’s specific gravity,” the formulation is not accurate enough, the specific reasons are as follows.