“asymmetrical ripple mark”的概念、定义、翻译、参考文献-科学参考

单词	asymmetrical ripple mark
释义	asymmetrical ripple mark [¦ā·sǝ¦me·tri·kǝl `rip·ǝl ´märk] ^GEOLOGY The normal form of ripple mark, with short downstream slopes and comparatively long, gentle upstream slopes.
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