英语翻译
First the British system of tendering uponsophisticated BQs enabled tenders to be obtained on a basis which wastheoretically that of a completed and worked-out design,but in practice couldsometimes be little more than a hypothetical construct.Design development,with an enormous number of changes both great and small,would therefore beundertaken during the construction stage.The contractor would find itdifficult to organize the work properly but had ample excuse to charge a pricewhich differed substantially from the original offer.