交通灾害的实质特征是它的社会性。
The essential character of the transportation catastrophe is sociality.
不管交通系统的规模和实力如何，都应该有一个应对所有可能灾害的计划。
Transit systems regardless of size and capacity should have a plan for all possible disasters.
不管交通系统的规模和实力如何，都应该有一个应对所有可能灾害的计划。
Transit systems regardless of size and capacity should have a plan for all possible disasters.
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