词汇	touchdown sign
释义	touchdown sign 降落征X线征象
随便看	laboratory-based computer laboratory-baseds laboratory beater laboratory bench laboratory benches laboratory benches or TABLES laboratory bioassay Laboratory biosafety laboratory block laboratory boy Laboratory Branch Complement Fixation test laboratory brush laboratory building laboratory buildings laboratory calender laboratory calibration methods Laboratory calorimeter laboratory cart laboratory cement laboratory center laboratory center of chemistry Laboratory Centre for Disease Control laboratory centrifuge Laboratory.centrifuge laboratory certification