酷热的非洲，几乎没有适于航海的河流，这些河流从内陆高原到海岸平原一路穿瀑布、过险滩，倾流而下。
Few of tropical Africa's rivers are navigable from the ocean, dropping as they do from interior tableland to coastal plains by a series of falls and rapids.
成都市红星路下穿市政隧道首次采用了顶部开孔的自然通风方式。
The first use of urban tunnel with upper vents is HongXing road tunnel in ChengDu.
成都市红星路下穿市政隧道首次采用了顶部开孔的自然通风方式。
The first use of urban tunnel with upper vents is HongXing road tunnel in ChengDu.
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