Risk assessment is one of the most effective measures to prevent invasion of alien species.
外来物种风险评估是防止外来物种入侵的最有效手段之一。
With frequent human activities, invasion of alien species are becoming increasingly serious.
随着人类活动的日趋频繁，外来物种入侵也日趋严重。
It is of great importance for all countries to prevent the invasion of alien species by application of laws and regulations.
通过法律规制外来物种入侵是各国防治外来物种入侵采取的重要手段之一。
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