这一变化意味着它得到了更好地物理保护，而且更难以在不明显损坏封面的情况下将其置换。
This change means that it's better physically protected, as well as more difficult to swap out without noticeable damage to the cover.
每次使用完毕后请仔细检查头盔是否损坏，如果头盔已磨损严重但无明显损坏，还是有可能需要立即更换。
Each time after use please carefully check that the helmet is damaged, if the helmet is worn out serious but no apparent damage, also is likely to require immediate replacement.
预防性养护是在沥青路面未出现明显损坏之前所进行的养护工作；治疗性养护是在路面发生损坏后所采取的维修养护。
The preventive curing is the curing work made before there is no obvious damage on bituminous pavement and the treatment curing is the maintenance curing made after damage is occurred on pavement.
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