单词	双铰软线--铰合软线
释义	双铰软线；铰合软线twisted cord
随便看	observation airplane observational observational astronomy observational day observational definition 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