单词	pith
释义	pithpith /pɪθ/ noun [uncountable] Etymology ETYMOLOGYpith Origin: Old English pitha 1 science, biology a white substance just under the outside skin of oranges and similar fruit2science, biology a soft white substance that fills the stems of some plants3the pith of an argument/issue etc. the most important and necessary part of an argument, etc.
随便看	ulterior ultimate ultimate fighting ultimate frisbee ultimately ultimatum ultra- ultra-high frequency ultralight ultramarine ultramodern ultranationalist ultrasonic ultrasound ultraviolet ultraviolet radiation ululate ululation Ulysses um umami Umatilla umber umbilical cord umbilicus

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