保育机构把外来物种列为原生物种的头号威胁。
Conservation organizations bill alien species as the foremost threat to native wildlife.
首先巴西从其它热带国家引进一些原生物种，Brachiaria草来自非洲；
Brazil imported some of its raw material from other tropical countries in the first place.
首先巴西从其它热带国家引进一些原生物种，Brachiaria草来自非洲；
Brazil imported some of its raw material from other tropical countries in the first place.
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