- 1. 我从书上得知，建长城的目的是为了抵御外侮和通讯联络。
- I read that the purpose of the Wall was defense and communication.
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- 2. 罗马军团击退外侮，但却只是初尝外患滋味，罗马从今以后都必须小心提防。
- The Roman Legions chased them back but it was only a taste of what was to come. Rome was now, and forever after looking over her shoulder.
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- 3. 为蚂蚁提供这种住宿环境对树也有好处，因为蚂蚁会为其房东提供非常重要的服务：守卫树木，抵抗外侮。
- Producing this accommodation also benefits the tree, for the ants provide their landlord with a valuable service: they guard it against its enemies.
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- 4. 为蚂蚁提供这种住宿环境对树也有好处，因为蚂蚁会为其房东提供非常重要的服务：守卫树木，抵抗外侮。
- Producing this accommodation also benefits the tree, for the ants provide their landlord with a valuable service: they guard it against its enemies.
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