单词	ultra sonic wave
释义	ultra sonic wave 超声波
随便看	utility frequency of word utility function utility func-tion Utility Knife With Blue Plastic Handle Utility Knife With Transparent Plastic Handle Utility Knife With Yellow Plastic Handle Utility functions Utility functions method utility fund utility funds utility furniture utility gallery utility gas utility gasoline engines utility gas plant utility generation utility glass ware utility glider utility goods utility-grade Utility Grade Multi-purpose Power Meter utility grade wood utility graph utility grease utility green