在我国长期以来，文言一直是统一的书面语言。
For a long period, Classical Chinese was our common written language.
飞剪机是我国长期以来一直引进的重要的冶金设备。
Flying shears equipment is one of the important continuously imported metallurgical equipment in China.
稻螟是我国长期以来的一种严重害虫，解放前因螟害常年损失稻谷10%以上。
The paddy borer is the chief pest of rice in China, causing an annual loss not less than 10% in average years before liberation.
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