backwardness造句
31. Ignorance and backwardness , should also not understand China's century - shame?
32. But the personage points out, the development of electric water regulator valve industry might be possible to use the great-leap-forward development of advantage of backwardness.
33. The reasons of food crisis included many aspects: frequent occurrence of natural disasters, backwardness of production technology, feudal exploitation, warlords rule, bandits looter, for.
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