critical zone

• 临界带,危险区域

critical zone的用法和样例：

例句

1. They were a hundred feet clear of the danger zone.
   他们离危险区域还有一百英尺远。
2. The unfortunate novice fliers are often the scrawniest ones or those that try to ride whispers of wind too weak to carry them over the danger zone.
   这些不幸的雏鸟往往都是最瘦弱的，要么就是在飞离危险区域的时候不巧风力不足。