这份感情，两个都在付出才能维持，单方面的撑着，没有人能撑太久。

这份感情，两个都在付出才能维持，单方面的撑着，没有人能撑太久。

Results (English) 1:

This relationship can only be sustained by paying for both. One-sided support, no one can sustain it for too long.

Results (English) 2:

This feeling, both are paying to maintain, unilateral support, no one can last too long.

Results (English) 3:

This feeling, both in pay to maintain, unilateral support, no one can last too long.