1. Their people have always been available to offer assistance and answer technical questions.
2. Redesigning congested traffic systems to add bike lanes to overcrowded roads is fiendishly difficult, especially in historic cities with narrow cobbled streets like Copenhagen.
3. 目前，中国人民的健康总体水平已经超过中等收入国家的平均水平，处于发展中国家前列。
4. 中国虽然取得了很大的发展成就，但中国人口多，底子薄，生产力不发达，发展很不平衡，生态环境、自然资源与经济社会发展的矛盾比较突出。
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