求翻译： 8、外形结构。开发初期，有的吸油烟机集流罩（捕集面）采用平面型式，捕集油烟的效果较差。改进为槽型集流罩，前部没有集流挡板，目前大部分吸油烟机均采用深箱型集流罩，捕集油烟的效果大为改善。其间也曾流行过超薄型、风帘型等结构的吸油烟机，但均因吸油烟效果不佳而淡出市场。近年来欧式吸油烟机在市场上较为流行，适应了新房装修的潮流。技术含量上又有新的要求，这对吸油烟机生产厂家来说是一个机遇也是挑战。是什么意思？

8, the shape of the structure. Early development, and some set of flow hood hood (capture area) using flat pattern, trapping smoke less effective. Improvements for the groove set flow hood, the front baffle is not set flow, present, most range hoods are box-set with deep flow hood, the effect of gre

8, appearance. In the early stages of development, cooking hoods group-class Enclosures group-oriented (rounded up) using two-dimensional model to grease traps less effective for the Group. Improving the trough-shaped group-class enclosures, the former Department did not have, at present, most Group

 8th, contour structure.The development initial period, some attract the lampblack machine collection class to cover (trapping surface) to use the plane pattern, the trapping lampblack effect is bad.The improvement for the trough collection class cover, the front part does not have the collecti

 8, shape structure. The initial stage, some range hood set flow hood (trapping) flat type, trapping oil smoke less effective. Improved flow for a Groove set cover, front no set flow baffles, at present most of the range hood are made of deep flow box-set cover, trapping oil smoke effect greatl

8, the shape of the structure. Early development, and some set of flow hood hood (capture area) using flat pattern, trapping smoke less effective. Improvements for the groove set flow hood, the front baffle is not set flow, present, most range hoods are box-set with deep flow hood, the effect of gre