Sent_en: 2zh Due to concerns over the amount of discharge taking place in waterways, the Corps of Engineers began in the 1980s to reduce the authority granted by nationwide permits and to bar use of the permits in certain ecologically sensitive areas.
Sent_yy: 由于对水路排放量的担忧，工程兵团从20世纪80年代开始减少全国范围内许可的授权，并禁止在某些生态敏感地区使用许可。