A laminated structural body is manufactured by laminating unidirectionally arranged strands and a web such that two layers of the web sandwich the strands therebetween. Each beaker has at least a bottom made of mesh allowing water to flow through. When it has been confirmed that the original data is not stored, the original data immediately before the updating corresponding to the place to which the updating has been executed is stored in only the storage area to store the latest snapshot. 0% of a surfactant system selected from the group consisting of cationic surfactant, nonionic surfactant, and mixtures thereof; from about 0.