与美国等发达国家相比，农业生产率仍很低。
Agricultural productivity remained low by comparison with advanced countries like the United States.
对于发达国家和发展中国家而言，绿色革命鼓励的农业实践的长期可持续性也令人担忧。
There are also concerns about the long-term sustainability of farming practices encouraged by the Green Revolution in both the developed and the developing world.
但是，与世界发达国家相比，中国农业科技水平还有较大差距。
But, compared to countries with advanced agriculture, China's agricultural science and technology lag far behind.
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