冰的硬度和混凝土差不多。

The hardness of ice is similar to that of concrete.

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用质量吊起物质，并调节弹簧的硬度和阻尼。

Hang masses from springs and adjust the spring stiffness and damping.

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树木的生长期受限于它的木质构造，后者决定树的硬度和形状。

A tree's rate of growth is limited by its lignin structure, which is what determines the tree's strength and form.

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