上海地铁M4号线建设重大事故发生后，对地下工程潜在的环境地质作用的研究显得特别重要。
The environment concerning with the underground engineering is significant to Shanghai City development, especially NO. M4 underground railway building accident occurring.
上海地铁M4号线建设重大事故发生后，对地下工程潜在的环境地质作用的研究显得特别重要。
The environment concerning with the underground engineering is significant to Shanghai City development, especially NO. M4 underground railway building accident occurring.
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