Significantly, this line marks the southern limit of the birch tree, a plant whose pollen is one of the causes of hay fever in northern Europe.
值得注意的是，这条线标志着桦树的南部界限，而桦树的花粉是引发北欧花粉热的一个原因。
Father, red sorghum claims to cure your fever; the age-old walnut tree professes.
父亲，红高粱说要治好您的发烧，老核桃树说。
Father, red sorghum claims to cure your fever; the age-old walnut tree professes.
父亲，红高粱说要治好您的发烧，老核桃树说。
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