从遥感影像中提取道路已有多年研究，但仍然存在很多问题有待解决。
People extract roads from remotely sensing image many years, but still some problems cannot be solved.
曲线梁桥还是有很多问题有待解决，预应力的损失就是其中较为典型和突出的问题。
There are still many issues to be resolved on curved girder bridge, one of them is loss of prestress which is much more typical and outstanding.
曲线梁桥还是有很多问题有待解决，预应力的损失就是其中较为典型和突出的问题。
There are still many issues to be resolved on curved girder bridge, one of them is loss of prestress which is much more typical and outstanding.
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