会吸烟的肺
Backwardness of science and technology例句：中国近代科技落后于西方的原因探析The Reasons of China Backwardness in Science and Technology 希望对你有帮助！
江南Andy
When technology not well developed, and people don't have too many recreational activities
牛奶泡泡韵
动词结构：science and technology drop/fall/lag behind (in science and technology)名词结构：underdeveloped science and technology a backward scientific and technological level scientific and technological retardation (极贬义）
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