ITA, as sponsor of this conference, is really pleased to welcome you all to this conference, and to open this tunnelling conference on underground construction and its risk prevention.

• 国际隧道工程和地下空间协会（ITA），作为这次“第三届上海国际隧道工程研讨会”的赞助人，欢迎各位参加本次会议，并讨论地下施工和风险防范。