底波echo: n. (pl. echoes) 1.回聲,反響;共鳴,反 ...backwall: 背墻 后膜 后墻; 后壁;后坡; 后膜,后壁; 后墻水冷壁backwall injection: 井壁背后灌漿backwall photovoltaic cell: 背墻光電伏打電池; 底板式阻擋層光電池; 后壁阻擋層光電池backwall photovoltaic effect: 后膜光電效應(yīng)下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯