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。
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。
It was found that the bound residues constituted a majority of the chemical residues in soil, rice plants and fishes.
结合态残留物是土壤、鱼和植株体中呋喃丹的主要残留形态。
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