一定材料的老化象nbr会导致硬化和可能的裂纹。
Ageing of certain materials such as NBR will result in hardening and possible cracking.
但是化肥很贵，而且本身可能威胁环境，而且还导致了土壤硬化和肥力下降。
But the fertilisers are expensive, can threaten the environment themselves and also cause the soil to harden and become less fertile.
高血钙水平导致动脉钙化(硬化)这一点可能也有助于解释这些结果。
High blood calcium levels are linked to calcification (hardening) of the arteries, which may also help to explain these results.
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