语言由于用词造句的规律不同，故在表达同一思想内容时，有时需要在英译文中增补一些中文原文中没有的词语或省略一些从译文角度来看是多余的词语，才能使译文更符合英语的表达习惯，更切合愿意。例如：5.原文：利用气流冲击试验机进行造型工艺试验，使用的型砂为南昌柴油机厂高压造型用砂。
译文：When the moulding technological test is carried out on the air impulse test moulding machine, the moulding sand employed is the sand used by Nanchang Diesel Factory for high-pressure moulding.
说明：译文中增加连词when及介词by和for,使语意明确，合乎英语表达方式。
6.原文：The noise made by this mechanism is low, which conforms to The National Noise Standards of Workers' Working Places for Newly-Constructed, Expanded and Reconstructed Industrials Enterprises.
说明：译文中增加made by,把原文中装置所发出的噪音的含义表示出来。增加关联词which,引出非限制性定语从句，以明确"装置噪音低"与符合国家标准 的逻辑关系。
7.原文：真正实砂耗气量是很小的，所以气流冲击实砂可减少压缩空气的消耗，收到节能的效果。
译文：The real air consumption for compacting the sand is low; therefore, the process of sand-impulsing and compacting by air flow may decrease the consumption of compressed air, which results in energy economy.
说明：增加the process of表示这个"工作法"所产生的效果。增加which的理由同前例。
三、长句处理
科技论文中长句较多，译成英语时，除有些地方须增补一些连词、介词或关联词外，一般仍可保持长句形式。但有的长句中说明语太长，为了便于理解，可按层次拆译成几个短句。例如：
8.原文：因此，气流通道面积大，所以该机构有助于提高气流冲击实砂时的压力梯度，从而提高实砂效果。
译文:Therefore, the area of air-flow passage is larger, so that the mechanism helps increase the pressure gradient during the impact of air flow against the sand, thus increasing the effect of sand-compacting.
说明：长句译成长句，语序基本相同。
9.原文：因此，关于阀的开启有效行程应当是指气包压力开始下降（即气箱压力明显上升）的A∣ 点到气包压力开始趋于平稳的B∣ 点阀所经历的行程。
译文：Therefore, the effective stroke of the valve during opening should be the distance the air valve travels from point A∣ to point B∣. At point A∣ the pressure in the air tank begins to fall (that is, the pressure in the clearance of the upper part of the flask begins to rise obviously). At point B∣ the pressure in the air tank begins to be steady.
说明：长句分译成三个短句，使之主次分明，句意清晰。
10.原文：本工艺具有造型速度快，生产效率高，工艺性能优良，综合经济效益高，劳动条件好等优点，引起世界铸造工作者的关注。
译文：This technology has the advantages of great moulding speed, high production efficiency, fine technological performances, excellent overall economic results and good labour conditions, excellent overall economic results and good labour conditions. Therefore, it has been taken notice of by foundry businesses all over all over the world.
说明：将长句译成两个短句。后面单成一句，说明前句的效果，更加突出。
