A carat is a weight measurement used only with some valuable minerals.

克拉是一种只用于测量某些贵重矿物重量的计量单位。

This can be a problem when using it as the single exact weight measurement tool.

这在将“大K”用作单一且精确的重量衡量工具时会成为问题。

So if I start from naught and mark off every centimeter as ten grams, then I should have enough space to fit in my weight measurements.

所以，如果我从零开始，把每厘米标记成十克，那么我应该有足够的空间来匹配我的重量测量。