求翻译：当约束较大或养护不当的时候，混凝土易产生裂缝，给侵蚀性氯离子和二氧化碳提供了通道，加快了有害离子侵蚀速率，造成混凝土劣化，缩短混凝土的结构使用寿命是什么意思？

When larger constraint or improper maintenance, the concrete is easy to crack, and provides a channel to the aggressive chloride ions and carbon dioxide, harmful ions accelerated the erosion rate, resulting in concrete deterioration, shortening the service life of concrete structures

When constraint is large or conservation of concrete, easy-to-cracking, to erosion of chloride ions and 2 carbon dioxide provides a channel to speed up the harmful ion erosion rate, causing deterioration of concrete, the concrete structure shortened life

When restrains big or maintains is improper, the concrete easy to produce the crack, has provided the channel to the corrosive chloride ion and the carbon dioxide, sped up the harmful ion corrosion speed, creates the concrete deterioration, reduces the concrete the structure service life

When the constraint when large or improper maintenance, easy to produce cracks in concrete, to the corrosive chloride ions and carbon dioxide provides a channel, speeding up the erosion rate of harmful ions, resulting in deterioration of concrete, and shorten the life of concrete structures

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