In recent months they had torn up railroad tracks and electric cables—noxious evidence of foreign intrusion—and left destruction in their wake.
noxious 通常有两个意思. 1. 有毒的 2. 令人不愉快的。你的句子中noxious evidence 应该是第二个意思。请看柯林斯词典对第二个意思的释义:
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