While (we were) there, we joined in voluntary labor on a project.
我们一到那儿，就自愿参加了这项工程。
The project requires more labor than the labor that has been put in.
该项工程极其困难，因此需要投入比已经付出的还要多的劳动。
The project requires more labor than has been put in because it is extremely difficult.
工程非常的困难，需要比已投入的还要多的劳力。
The project requires more labor than has been put in because it is extremely difficult.
工程非常的困难，需要比已投入的还要多的劳力。
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