The full impact of an alien species on an area's habitat may not come to light until decades after its intentional introduction, a report has warned.

报道提醒，直到十年前特意引进外来物种后，它们对区域生境的整体影响力才为人所知。

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Many species of alien marine organism were introduced to China by intentional introduction for their economic or social significances or by unconscious activities such as ballast water discharge.

外来海洋生物是基于某一物种所具有的经济或社会意义而从外地有目的地引进，或者由于无意识的活动如航运业中的船体附着以及压舱水的排放等而带入的。

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The proportion of alien invasive species originating from the tropic zone was close to that from temperate regions. The proportion of alien invasive plants caused by intentional introduction was 39%.

外来入侵物种中热带来源与温带来源比例相当，人为引入导致的外来入侵植物高达39%。

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