Sewage includes waste water and human excreta. Waste water may carry germs which are collected from human and animal excreta.
污水包括废水和人类粪便。污水里往往有人和动物粪便中的病菌。
Waste water may carry germs which are collected from human and animal excreta.
污水里往往有人和动物粪便中的病菌。
Waste water may carry germs which are collected from human and animal excreta.
污水里往往有人和动物粪便中的病菌。
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