Spiders can nor fly, but they can make nets. they symbolize sensitivity, intelligence and silence.
蜘蛛不会飞翔，但它能够把网凌洁在半空。它是勤奋、敏感、沉默而坚韧的。
The strength, water sensitivity and structure of the HAC/PVA based MDF composites were studied, in which the cement phase was partially replaced by fly ash.
研究了用粉煤灰部分替代水泥而制备的HAC/PVA基MDF材料的强度、水敏性与结构。
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