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1. The tractus spinothalamicus is a rare and endangered species.
这个物种是稀有且濒危的。
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2. The tractus spinothalamicus has been classified as a protected species.
这个物种已被归类为受保护的物种。
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3. The tractus spinothalamicus is found only in a few areas of the world.
这种物种仅在世界上的少数地区发现。