但是近年来外来水生生物物种引发了多起生态灾难事件，对生态环境安全构成了严重威胁。

But in recent year, many ecological disaster events has been initiated by aquatic organisms from foreign area, posing serious threat to ecological environment security.

youdao

但是近年来外来水生生物物种引发了多起生态灾难事件，对生态环境安全构成了严重威胁。

But in recent year, many ecological disaster events has been initiated by aquatic organisms from foreign area, posing serious threat to ecological environment security.

youdao