我曾经来过，还会再来，但我尚未完成这次旅程。
I've been here before and will come again, but I'm not going this trip through.
Python或许可以取代Perl(因为它拥有相当短小的数据库处理指令)，但是我尚未完成Python的测试实现。
Python may work instead of Perl (as it has fairly short database manipulation directives), but I haven't done a test implementation in Python.
我试图争辩，但他却反驳说各项计划尚未完成。
I tried to argue but he countered that the plans were not yet finished.
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