希尔兹说：“它们还达不到我们的安全标准。”
希尔兹曲线是表达泥沙起动切应力的实验曲线。
Shields diagram is an experimental curve which describes the bed shear stress for the grains of sediment in critical condition.
希尔兹说，她很好说话，只要求在里面垫上鞋垫。
She was a good sport, Ms. Shields said, asking only for insoles to pad the boots' interior.
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