以下为句子列表：
英文: Before the construction of bridge over navigable rivers, esp. on the reach of complicated topographical and flow conditions, factors such as bed evolution, bridge site's choice, clearance dimensions, navigation condition and safety-ensuring measures, etc.
中文: 摘要在通航河流，尤其是在桥区地形、水流条件复杂河段处进行桥梁建设前，必须对河床演变、桥位、净空尺度、通航条件和安全保障等因素进行论证。
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