knee-high       
adjective uk/ˌniːˈhaɪ/ us/ˌniːˈhaɪ/
 齐膝高的
tall enough to reach your knees
  knee-high grass/boots 齐膝高的草/高及膝盖的靴子 
 Idiom  
be knee-high to a grasshopperidiom  informal humorous 身材矮小;幼小
to be very small or young
 
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