当他坚持周日工作要额外付费时，我回答：“可以理解。”

When he insisted on extra pay for Sunday work, I replied, "___Fair ___enough."

避开拥挤的道路可以理解，但替代路线变得拥挤不堪。

It's ___fair ___enough to avoid crowded roads, but alternative routes become packed.

如果你不能参加聚会，可以理解，我们改天再聚。

If you can't attend the party, ___fair ___enough, we'll catch up another time.