英语翻译

英语翻译
Constructional Requirements
As food must be processed in a hygienic environment,the cost of maintaining this environment should be taken into account,when designing and constructing a food factory .The additional capital cost associated with a well-designed factory is more than offset by the savings on cleaning costs.
When designing roof structures,external valleys should be avoided even partial blocking of such valleys will lead to the presence of stagnant water,which can be a source of food contamination.For similar reasons,gutters must be designed so that they can be easily cleaned.Drainpipes should be water-trapped at the entrance to storm or other drains.Access to roofs should be external rather than internal,so as to avoid contaminants from roof surfaces being brought into the premises
Internal open-girder work should be avoided,and ceilings should be smooth and impervious.Ceilings should be accessible for cleaning,and ideally,the surface should he coved where ceilings and walls meet In many food-production areas,the ceiling must have thermal insulation This may be necessary either to prevent surface condensation or to reduce the energy costs of maintaining low environmental temperatures.
Walls should also be insulated,to prevent surface condensation They should be free from rising damp and be protected,where appropriate,from damage by forklift trucks,by use of a guard rail In modern factories,there is always a coved surface where walls meet the floor It is also usual for there to be a coved surface where walls join at right angles.The purpose of these coved surfaces is to avoid corners and thus aid cleaning.Panels are frequently used to construct walls,and,if used,they must be adequately sealed.There should be no internal horizontal ledges,such as window sills.Such ledges lead to the accumulation of dust and foreign material.Where ledges are unavoidable,they should be sloped,at a minimum angle of 45o.
我自己翻译的好拗口,请高手帮我翻译通顺点．谢谢!
不要求很对,但要求很通顺!