无活塞环发动机
Staff checked with the Rutland Osprey Project which said it was an unringed juvenile, probably from Scotland.
BBC: Osprey visits Sussex Wildlife Trust
unringed:
un- +? ringed
英汉双解词典包含3185865条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。