距離太長，為何直布羅陀海不建呢？費用太高，通風設備，事故處理等，難題太多。如在戰時，敵方一枚定點深水炸彈就能癱瘓整個隧道。

來源: SHIFRA 於 2013-07-13 16:55:23 [舊帖] [給我悄悄話] 本文已被閱讀：次

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