请问：overhead crossing和pedestrian walkway 是什么意思?谢谢啦

请问：overhead crossing和pedestrian walkway 是什么意思?谢谢啦 overhead overhead overhead predetermined overhead high overhead routing overhead overhead storage 英语翻译Overhead bridges can be seen in many parts of Singapore,in the places where traffic is very heavy and crossing the road is not safe.These bridges can help people cross roads safel.Overhead bridges are used in very much the same way as zeb Share of overhead里面的overhead allocation ,overhead apportionment ,overhead absorption分别是什么意思? overhead project什么意思 如何减少 overhead cost overhead projector是什么意思 route overhead是什么意思? overhead-paging是什么意思 minimal computational overhead翻译 overhead projector是什么意思 overhead compartment是什么意思