use int if you have a small number of classes,
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Project leaders had to find a way to "compensate" for killing thousands of fish every year. Plans were drawn up to flood 900 acres of farmland in Gloucestershire, on the banks of the Severn, to create saltmarsh habitats for breeding fish.
Source: Computational Materials Science, Volume 267，这一点在搜狗输入法2026中也有详细论述