求翻译：1、净化方式。早期开发的吸油烟机基本上是仿制进口样要，内循环吸附式吸油烟机和吸附外排式吸油烟机都有生产，但这类产品因不适合中国的厨房条件而自行淘汰，目前基本上均采用了外排式吸油烟机，少数厂家采用了铝孔板吸附式外排式结构。是什么意思？

1, purification. Early development of the range hood is basically a kind of imitation to be imported, hood inner loop adsorption and adsorption efflux hood has produced, but such products are not suitable for China because of the conditions themselves out of the kitchen, the current basic are used o

1, purification methods. Early development of cooking hoods is basically a imitation imports, as it is the revolving adsorption cooking hoods and Adsorption, mine cooking hoods have a production, but such products are not suitable for China's Kitchen conditions are used on its own, there are basical

1st, purification way.The early development attracts the lampblack machine basically is imitates the import type to want, the internal recycling adsorption type attracts outside the lampblack machine and the adsorption a row of type attracts the lampblack machine all to have the production, but beca

1, cleaning method. Early development of range hood is basically imitation imports to, within and outside the cycle adsorption type range hood and adsorption-row range hood has a production, but such products because they do not suit for Chinese condition itself out of the kitchen, now basically use

1, purification. Early development of the range hood is basically a kind of imitation to be imported, hood inner loop adsorption and adsorption efflux hood has produced, but such products are not suitable for China because of the conditions themselves out of the kitchen, the current basic are used o