获取自然环境中的某些部分，再将它们重新组装成湿地或者草原，只是建立生态区的办法之一，生态学家们把这种办法叫做“比对”法。
Constructing a wetlands or savanna by reassembling portions of a natural one is only one method of biome building — which the ecologists call the "analog" way.
雅库特，这一块土地之上还保留着原生态的自然环境。对于那里的许多野生动物来说，甚至还从没见识过“人”这种两腿行走的生物。
Yakutia is the land of untouched nature and wild animals some of which haven't ever seen a man.
城市的自然环境是城市生态系统中的重要组成部分。
The urban natural environment is an important part of urban ecological system.
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