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词汇 undercutting
释义 ☞ undercutundercutting/ˌʌndəˈkʌtɪŋ ||; ˌʌndɚˈkʌtɪŋ/noun [u] (in geography 地理学) the destruction by water of a softer layer of rock below a hard top layer so that after a long period of time the top layer is not supported and falls down 底切,暗掘(指岩层底部的松软部份被水流掏空,久而久之便塌陷) ☞ undercut
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