proboscis       
noun [ C ]  biology specialized uk/prəˈbɒs.ɪs/ us/proʊˈbɑː.sɪs/  probosces
 (动物的)长鼻;(昆虫的)喙
the long nose of some animals, or the long tube-like mouth of some insects
  An elephant's trunk is a proboscis. 象鼻很长。 
 
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