在一个完全陌生的环境里，你必须随时保持警惕。
You must keep alert when you are in a completely unknown environment.
当幼儿初次踏入活动室时，活动室的环境对他来讲是完全陌生的和新鲜的。
When the children first entered the activity room, activities room environment for him, is completely unfamiliar and fresh.
但是一旦离开学校，他们的小圈子就会崩塌，瞬间暴露在一个完全陌生的环境中。
But once they leave school, their small societies will collapse, exposing them to an unfamiliar environment overnight.
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