Piracy is banned over and over but keeps springing back, like grass in the spring wind.
Tips
history
The second half of a famous couplet in Bai Juyi's (白居易) Tang poem 《赋得古原草送别》: 离离原上草，一岁一枯荣。野火烧不尽，春风吹又生 — 'Lush grasses on the old plain, each year they wither and flourish. Wildfire cannot burn them off; the spring wind blows and they grow again.' Written when Bai was sixteen.
usage
Can be positive (resilience, a cause that cannot be suppressed) or negative (a recurring problem that keeps returning). Usually paired with 野火烧不尽 for the full allusion.
