The experiments and calculation indicate that the common Stokes formula is only suitable to the situation with small grain settling Reynold number.

实验及计算表明：常用的斯托克斯公式仅适应于颗粒沉降雷诺数较小的情况；

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Later on when times are more secure, there's trade for grain as well for everything else, but when you're settling a place in the first place, you can't rely on somebody bringing it to you.

在之后相对安定的年代,有了粮食及其他各种物品交易,但当你刚开始在某地定居时,并不能指望有人为你供给必需品

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