seikan tunnel

基本解释

This would exceed the combined lengths of the two longest undersea tunnels on Earth, the Seikan Tunnel and the Channel tunnel.
这将超过地球上两个最长的海底隧道青函隧道和英法隧道的长度总合。
Thee tunnel has overtaken Japan's 53.9km Seikan rail tunnel as the longest in the world and pushed the 50.5km Channel Tunnel linking the UK and France into third place.
这条隧道超越了此前的世界之最--日本全长53.9公里的青函海底隧道，将全长50.5公里的英吉利海峡隧道挤到了第三的位置。
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The Tsugaru Strait separates Hokkaido from Honshu, although the two islands are connected by the underwater railway Seikan Tunnel.
津轻海峡连接了北海道和本州岛，同时青函海底隧道也将两个岛屿紧密相连。