When Wang Er-Chern began trading agricultural produce in northern Thailand in the early 1990s, it took two weeks to send goods by road and ship via Laos to his native Yunnan.
上世纪九十年代早期，当Wang er - Chern开始在泰国北部交易农业产品时，他花了两周的时间才把货用船和货车途经老挝运到了云南本地。
Yunnan could be a good base to produce cocoon with high quality because of its suitable natural conditions in mulberry planting and silkworm rearing.
云南具有世界上比较适宜栽桑养蚕的自然条件，是生产优质原料茧的好基地。
YunNan copper sulfuric acid branch factory USES copper metallurgical off-gas to produce sulfuric acid.
由于铜冶炼烟气波动较大，给硫酸生产过程的控制造成一定的难度。
YunNan copper sulfuric acid branch factory USES copper metallurgical off-gas to produce sulfuric acid.
由于铜冶炼烟气波动较大，给硫酸生产过程的控制造成一定的难度。
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