Kiaochow Bay subsea tunnel is the second self-building tunnel in China with the designed service life over 100 years.
胶州湾海底隧道是中国自行建造的第二条海底隧道，其服役寿命为100 a。
Kiaochow Bay subsea tunnel is the second self-building tunnel in China with the designed service life over 100 years.
胶州湾海底隧道是中国自行建造的第二条海底隧道，其服役寿命为100 a。
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