Translation of "returnable" into Chinese

Eligibility in theory there is, but, because of other unmentioned provisions, the overall amount of land actually returnable will scarcely be increased, if at all.

理论上存在合格性,但是由于没有提到的其他规定,实际可归还的土地即使有所增加,增加的总面积也微不足道。

and now I had regressed back to a point where there seemed to be no return.

现在我退回到了一个似乎不可返回的点上。