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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。 - 2
Broadcasting network by satellite, with its wide frequency band and vast overlay, ACTS as an excellent medium for the widespread of information. 卫星广播电视网以其频带宽、覆盖面广的优点，为信息的传播提供了非常良好的媒介。 - 3
Research on theory and methods of the overlay on existing rigid concrete pavements, which is on semi-infinite elastic medium to moving load, is involved in this paper. 本文讨论移动荷载下、弹性半空间地基上的刚性道面水泥混凝土加铺层的动态设计理论和计算方法，并试图把此套方法与场道无损检测评估系统结合起来。
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