Once the outbreak of TB would be difficult to prevent, because it is through air-borne.

结核病菌一旦爆发就难以预防，因为它是通过空气传播。

youdao

Once the outbreak of TB would be difficult to prevent, because it is through air-borne.

结核病菌一旦爆发就难以预防，因为它是通过空气传播。

youdao