“dry valley”的概念、定义、翻译、参考文献-科学参考

单词	dry valley
释义	dry valley [¦drī `val·ē] ^GEOLOGY A valley, usually in a chalk or karst type of topography, that has no permanent water course along the valley floor.
随便看	pisoparite pistachio pistil pistillate pistol pistol lanyard piston piston attenuator piston blower piston corer piston displacement piston drill piston engine piston flow piston gage piston head piston meter pistonphone piston pin piston pump piston ring piston rod piston skirt piston speed piston-type area meter

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