1.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。
2.Screens, light and flexible, can be installed to prevent invasion of the mosquitoes and insects.
可配置纱网，轻巧灵活，有效防止蚊虫入侵。
3.Subsequently, the blood will form a barrier to prevent invasion of other bacterium.
随后，血液就会形成一道屏障，阻止其他细菌入侵。
4.To prevent invasion of internal hemorrhoids.
以避免内痔的侵袭。