On one hand person is the assuror for the secure operation, on the other hand the causer and casualty for the accident.
人,是安全的保证,同时也可能是事故的引发害。
On one hand person is the assuror for the secure operation, on the other hand the causer and casualty for the accident.
人,是安全的保证,同时也可能是事故的引发害。
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