建筑材料必须坚固以承受恶劣条件。

Construction materials must be ___tough to withstand harsh conditions.

户外爱好者喜欢耐用的装备。

Outdoor enthusiasts prefer ___tough gear for durability.

这种面料出奇地坚韧，抗撕裂和磨损。

This fabric is surprisingly ___tough, resisting tears and abrasions.