污染 wū rǎn (lit. and fig.) to pollute; to contaminate Example sentences 河水污染严重，影响了整个生态系统。 héshuǐ wūrǎn yánzhòng, yǐngxiǎngle zhěnggè shēngtài xìtǒng. The river water is heavily polluted, affecting the entire ecosystem