词汇	买旧的
释义	买旧的 buy second-hand
随便看	observer rs handbook observer rs meridian observers observers apparatus observer's apparatus observerscop observerscope observerscopy observer's error observers eye observer's eye observership observerships observer sitting observer's meridian observer's meridian circle observers of modern life observers of the political scene observer states observer status Observer Target Acquisition Subsystem Observer Target Distance observer-target line Observer Target Range observer-target range