内因和外因两个方面
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both internal and external causes
内因和外因都有
以上为机器翻译结果，长、整句建议使用 人工翻译 。
So we'll be conducting both the internal activity as well as an external review immediately to ascertain the causes and circumstances under which this tragedy occurred.
CNN: O'Keefe: 'A tragic day for the NASA family'
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