TBM )A tunnel boring machine ( TBM ) is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.是什么意思_TBM )A tunnel boring machine ( TBM ) is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句