这款手机的坚固耐用性使它非常适合户外冒险。

The ___ruggedness of this phone makes it ideal for outdoor adventures.

这条徒步小路的崎岖不平使它成为对体力的真正挑战。

The ___ruggedness of this hiking trail makes it a real challenge for physical fitness.

她的坚韧性格让她在困境中从不放弃。

Her ___ruggedness of character kept her going through tough times.