Our army had a life - and - death fight with the enemy at the outer walls of the city.

我军在外城和敌人展开了殊死搏斗.

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Vegetation can even take up effluent via sub - surface irrigation , especially in outer urban and rural sites.

植被甚至可以通过表面灌溉吸收污水,由其在外城或者乡村地带.

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