It is a world difficult problem that the protein feed is insufficient, so developing compound protein feeds is one of the effective ways to solving this problem.
蛋白质饲料不足是世界性难题，研制复合蛋白饲料是解决这一问题的有效途径之一。
Traffic problem is an important one of the people's livelihood. City traffic problem is a world difficult problem. We must take some steps and measures to reduce the city traffic congestion.
交通问题是重大民生问题，城市交通问题是世界的难题，必须要采取多种措施，多种方式努力缓解城市交通拥堵。
Traffic problem is an important one of the people's livelihood. City traffic problem is a world difficult problem. We must take some steps and measures to reduce the city traffic congestion.
交通问题是重大民生问题，城市交通问题是世界的难题，必须要采取多种措施，多种方式努力缓解城市交通拥堵。
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