ruggedness基本解释
n.强度;坚固性;耐久性;崎岖
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n.强度;坚固性;耐久性;崎岖
n.强度;坚固性;耐久性;崎岖
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"the ruggedness of the mountains"
"he assigned a series of problems of increasing hardness"
"the ruggedness of his exams caused half the class to fail"