ruggedness
n. 强度；坚固性；耐久性；崎岖
近义词：toughness，roughness，rockiness，harshness，manliness，masculinity，resilience，stamina，difficulty，severity，sturdiness，robustness，huskiness，hardness，
英英释义
Noun
- the property of being big and strong
- the quality of being topologically uneven;
"the ruggedness of the mountains"
- the quality of being difficult to do;
"he assigned a series of problems of increasing hardness" "the ruggedness of his exams caused half the class to fail"
例句
用作名词(n.)
- Also about two bone seams do not overlap mutually, thus strengthened the tortoise shell ruggedness.且上下两层骨缝互不重叠，因而增强了龟壳的坚固性。