Update Required
To play the media you will need to either update your browser to a recent version or update your Flash plugin.
翻译解释
backbone英语什么意思：脊骨，脊椎；分水岭；主要山脉；主要成分；中枢；中坚，骨干；主力；刚毅，骨气；书脊 (the backbone of a defence 防御主力。 to the backbone 完完全全，纯粹，十足，彻头彻尾。 an Englishman to the backbone 道地的英国人)。
