威胁东北虎种群生存的两个最主要因素是捕猎、生境丧失和破碎化。

The primary causes for the decline of the tiger population were poaching, habitat loss, and habitat fragmentation.

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由于人类活动等原因，自然生境在日益丧失和破碎化。

Natural habitat has been increasingly fragmented due to human activity and other reasons.

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