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major accident
met.	大事故
space	严重事故
tech.	主要事故; 重大事故
major accident An unexpected occurrence, failure or loss beyond normal or specified levels with the potential for harming human life, property or the environment
environ.	重大事故 (一种意外的事件，其破坏或危害超出正常水平或人类生命、财产或环境的潜在的承受水平。)

major accident: 8 phrases in 4 subjects

China	3
Economy	2
Environment	2
Technology	1