Food Self-Sufficiency Ratio 粮食自给率
self-sufficiency ratio 自给率
Emergy Self-sufficiency Ratio 能值自给率
For a long time, the Chinese tobacco stick in the "self-sufficiency," the market closed, exports export ratio is very low.
长期以来，中国烟草固守于“自给自足”的封闭市场，出口外销比率非常低。
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