Note the differences in the external features of each worm, namely the increased number of sensory structures and the presence of multifunctional appendages on annelid 1.
注意每只虫外部特徵的差异，观察环节动物1上众多的感觉构造及其多功能的附肢。
Note the differences in the external features of each worm, namely the increased number of sensory structures and the presence of multifunctional appendages on annelid 1.
注意每只虫外部特徵的差异，观察环节动物1上众多的感觉构造及其多功能的附肢。
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