HSK 7-9
守护
shǒuhù动
to guard; to protect
志愿者日夜守护这片湿地。
Zhìyuànzhě rìyè shǒuhù zhè piàn shīdì.
Volunteers protect this wetland day and night.
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Appears across levels (7-9) in the HSK 3.0 word list.