I don't think this particular service is a proof of laziness.
我不觉得这项服务证明人们懒惰。
To obtain proof of volunteer service;
获得志愿者服务证明；
The key to the extension of service life of steel structures lies in corrosion-proof.
延长钢结构的使用寿命，关键在于钢结构的防腐蚀。
The key to the extension of service life of steel structures lies in corrosion-proof.
延长钢结构的使用寿命，关键在于钢结构的防腐蚀。
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