求翻译：developed for research purposes in the field of civil engineering. The main challenge underlying all three projects has been to develop是什么意思？

待解决

悬赏分：1 - 离问题结束还有

developed for research purposes in the field of civil engineering. The main challenge underlying all three projects has been to develop

问题补充：

匿名	2013-05-23 12:21:38

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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