billion-dollar grass
词源说明
Probably so-called because of the adverse impact of Echinochloa weeds on yields rice and other crops.
释义（英文）
名词 Noun
- Any member of the genus Echinochloa of barnyard grass, widely considered harmful weeds.
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Probably so-called because of the adverse impact of Echinochloa weeds on yields rice and other crops.