The first bridges were made by nature itself — as simple as a log fallen across a stream or stones in the river.
桥的出现本是自然之笔——小溪之上的一根原木，或大河之中一堆砾石。
Time can take away many things. Youth, happiness and precious life seem very fragile in front of the indifferent nature, whereas stones can endure the test of time.
时间可以带走很多东西，青春、快乐和宝贵的生命在无情的大自然面前显得十分脆弱，但对坚定的石头却无可奈何。
The influence of grading and forming method in mixed material nature was studied so that the relation between pavement crack and crushed stones basic level mix material is further studied.
为了进一步研究路面裂缝与碎石基层材料的关系，首先就级配及成型方法对混合料性质的影响进行了广泛研究。
The influence of grading and forming method in mixed material nature was studied so that the relation between pavement crack and crushed stones basic level mix material is further studied.
为了进一步研究路面裂缝与碎石基层材料的关系，首先就级配及成型方法对混合料性质的影响进行了广泛研究。
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