John felt better at the end of the day when he saw the father returning from the fields, as if that made the day complete, as if things were safe.
在夜幕降落的时候看见那个父亲从农田里回来，约翰会觉得好多了，好像这样一天的时间才是完整了，好像这样才会觉得放心。
So between 1510 and 1514 he worked on it, gradually improving his theory until he felt it was complete.
因此在1510年和1514年之间他工作了对此，逐渐改进他的理论，直到他感到它是完全的。
He felt he was a complete failure.
感到了彻底的失败。
So between 1510 and 1514 he worked on it, gradually improving (improve)his theory until he felt it was complete.
于是，他在1510 年至1514 年期间从事这项研究，逐步改善提高他的理论，直到他感到完善时为止。
So between 1510 and 1514 he worked on it, gradually improving (improve)his theory until he felt it was complete.
于是，他在1510 年至1514 年期间从事这项研究，逐步改善提高他的理论，直到他感到完善时为止。
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