unaided

形容词 unaided:

1. carried out without aid or assistance

1. An optical instrument that uses a lens or a combination of lenses to produce magnified images of small objects, especially of objects too small to be seen by the unaided eye.
   显微镜用一个透镜或一些透镜的组合来制造小物体的放大形像的视力工具，通常用来观察肉眼看不到的物体
2. The baby cannot sit unaided she has to be propped up on pillows.
   那婴儿还不会坐--得让她倚著枕头才行。