The duty-bound promise, though only taking root in the pure soil of my heart quietly, has always been my motive power to strive.
尽管这义不容辞的承诺，只是默默地植根在我纯洁的心壤上，它成为我奋斗的动力。
2
Where land is cropped regularly, there are bound to be times when the soil life is reduced.
定期耕种的地方，就必然有土地寿命减少的时候。
3
Second, the state of inter-aggregate pore water of cohesive soil is determined by(balanced) condition between damping of bound water membrane and permeability pressure of hydraulic gradient.