It is also pointed out that, in addition to those described above, the sources of kosa occurrence may also exist in the northeastern part of China (former Manchuria), the northern part of Mongolia and some parts of Russia. |
またこれ以外に、中国東北部(旧満州)、モンゴル北部、ロシアの一部なども発生源となっている可能性が指摘されている。 |