城市公园建设取得虽很大成就，但存在题目也很多，急需改进进步。

Although great achievements have been made in this field, a quite few problems which need settling, are still available.

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但是，目前我国的经济适用住房政策在实施中出现了不少问题，急需改进。

But, our country's economy was suitable the housing policy to have many problems at present in the implementation, urgently needed improvement.

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在各地拥挤的机场(尤以纽约、华盛顿和芝加哥为甚)，喷气式飞机排成了康加舞队形，导致了长时间的误机，美国空中交通管制系统急需改进。

Conga lines of jets at crowded airports, particularly in New York, Washington, D. C., and Chicago, led to long delays and calls to modernize the nation's air-traffic-control system.

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