die back
柯林斯词典
1. N a disease of trees and shrubs characterized by death of the young shoots, which spreads to the larger branches: caused by injury to the roots or attack by bacteria or fungi (植物根部受伤或受细菌、真菌等侵害造成的)顶梢枯死
2. V (of plants) to suffer from dieback (植物)顶梢枯死
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