Professional assistance can come on various levels and include architects, designers and contractors, who specialize in areas like masonry, plants, hardscape, decking, and irrigation.
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The person commissioning designers and contractors, etc.
委托展览设计者和展览承包商的人等。
Designers and contractors should be alert to constant innovations in bridge design and construction methods.
设计者和承包商们要注意桥梁设计和施工方法的不断革新。
American designers and contractors have expertise and experience with cable assemblies in bridge structures.
美国设计者和承包商们具有在桥梁结构中使用钢索装配的专长和经验。
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