unaided是什么意思？

unaided

例句

• There have been at least thirteen previous attempts to reach the North Pole unaided. 之前至少已经有过13次想独立到达北极的尝试。
• That comet is invisible to the unaided eye. 那颗彗星只用肉眼是看不到的.
• Gross crystalline imperfections like twinning are apparent to the unaided eye. 粗的晶体不完整性,如孪生体可用肉眼看出.
• This fungus can just be detected by the unaided eye. 这种真菌只用肉眼就能检查出.