在应对紧急情况时，预制的简易房屋和专门开发的紧急庇护住宅单元，都未被证明是有效的。
Neither prefabricated buildings nor specially developed emergency shelter units have proved effective in displaced person emergencies.
在应对紧急情况时，预制的简易房屋和专门开发的紧急庇护住宅单元，都未被证明是有效的。
Neither prefabricated buildings nor specially developed emergency shelter units have proved effective in displaced person emergencies.
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