就在那时，我恰好环顾了下四周。It was just then that I chanced to look round.这座城市建在岩石上，四周筑有城墙。The city was walled and built upon a rock.一些小东西在帐篷四周的草丛里窸窸窣窣地动着。Small things stirred in the grass around the tent....
Engineering completely new symbiotic relationship is obviously not an imminent possibility.工程上完全新的共生关系显然是可能性不大....fungi that have a symbiotic relationship with the trees of these northwestern forests...与西北部这些森林里的树木存在共生关系...