... 义务人 obligor 义务性oughtness 义务植树 voluntary tree planting ...
双语例句
1
He kept pushing towards the "oughtness" of tomorrow.
他不停地推动实现“应然”(oughtness)的明天。
2
I refuse to accept the idea that the 'isness' of man's present condition makes him morally incapable of reaching up for the eternal 'oughtness' that forever confronts him.