external invasion by pathogenic factor 病邪外侵
external invasion plants 外来入侵植物
external invasion species 外来入侵物种
First chapter I embarks the external invasion species outline.
第一章主要从对外来入侵物种的概述出发。
Its main purpose was to safeguard the country from external invasion.
它被建造的主要目的是为了保证国家免于外来入侵的威胁。
The route of invading and the harm of the external invasion plants were analyzed. Some Suggestions about prevention were put forward.
对这些植物的入侵途径和危害进行了分析，并提出一些防治建议。
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