调查意外成因
Investigate the cause of the accident
以上为机器翻译结果，长、整句建议使用 人工翻译 。
当局曾在200个交通意外黑点深入调查，以确定意外的普遍成因，并为其中147个地点建议预防意外的措施。
In-depth investigations were carried out at 200 traffic accident black spots to identify common accident causes. Remedial accident prevention measures were recommended at 147 of these locations.
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