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这块石头很坚硬。
@This@ stone is very hard.
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金属通常比木材坚硬。
Metal is usually harder than wood.
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他用坚硬的工具修理机器。
He repaired the machine with hard tools.
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这座建筑的墙壁非常坚固。
The walls of this building are very sturdy.
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坚韧的材料可以承受更大的压力。
Tough materials can withstand greater pressure.
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这本书的封面是坚硬的。
The cover of @this@ book is hard.
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她的心像石头一样坚硬。
Her heart is @as@ hard @as@ stone.
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坚硬的表面不容易划伤。
A hard surface is not easy to scratch.
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他对这个问题的态度非常坚决。
@His@ attitude towards @this@ @issue@ is very hard.
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我们需要选择坚固的建筑材料。
We need to choose sturdy building materials.