单词	執棍的
释义	同Clavigerous
随便看	observational equation observational error observational frequency observational learning observationally observationally equivalent observational method observational network observational point observational research observational site selection observational skill observational statement observational study observational twilight observation and learning activities observation angle observation angle (of a retroreflector) observation angle [of a retroreflector] observation apparatus observation aviation observation balloon observation battalion observation board observation boat