zhuān jiā / jiàn yì / xiān / chá qīng / hé liú / fù jìn / de / wū rǎn yuán / zài / zhì dìng / zhì lǐ / fāng àn

专家建议先查清河流附近的污染源，再制定治理方案。

Experts recommend identifying the sources of pollution near the river before developing a remediation plan.