Meanwhile, the resin of urea and formaldehyde is used for medium-density overlay (MDO), a combination of concrete and plywood, used in concrete moulds.
同时，尿素甲醛的树脂用于制造中密度板(MDO)，这是一种混凝土和夹板的组合体，通常用于混凝土模具中。
The signboard was cut from medium-density-overlay plywood (MDO) using jig and band saws, and the lettering is comprised of PVC.
用夹具和环形锯将标识板切割成中等密度的胶合板，字母是用PVC板做成的。
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