求翻译：从肠衣生产的历史来看, 过去的肠衣生产主要集中在发展中国家, 中国出口的肠衣一度占世界肠衣出口总量的一半以上.是什么意思？

From the historical point of view of the casings, the casings of the past mainly in developing countries, China's exports casings once accounted for more than half of the total exports of the world casings.

sausage casings from production in the history of the past, sausage casings Production was concentrated in developing countries, China's exports of clothing and a intestinal casings of world exports more than half of total.

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From the history of sausage production, sausage production is mainly concentrated in the developing countries in the past, casing once China's exports accounted for more than half of the casing of the world exports.

The history produced which from the sausage casing looked that, the past sausage casing production mainly concentrated in the developing nation, the sausage casing which China exported once accounts for the world sausage casing exportation total quantity one above the half.