All the cartons are lined with plastic sheets, so they're absolutely waterproof, I can assure you.
所有纸箱都内衬塑料纸，我可以保证绝对防水。
May be made waterproof mortar cement as rigid waterproofing absolutely first-class.
亦可与水泥制成防水砂浆，作为刚性防水绝对一流。
Although the role of waterproofing in Shanghai Subway stations an additional waterproof layer plays is limited, its auxiliary effect in the comprehensive waterproofing system is absolutely necessary.
附加防水层在上海地铁车站工程结构中的防水作用既是有限的，又是必不可少的，在车站综合防水体系中起着辅助防水的功效。
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