The vertical tail size is not set to avoid spiral instability because this mode is not critical.
垂尾的大小不是根据避免螺旋不稳定来确定的。因为这种运动模态不是设计状态。
Some Africa-watchers fear that parts of the continent may be getting trapped in a downward spiral: more babies mean more competition for resources, more instability—and more babies.
一些非洲观察家担心非洲大陆的部分地区正在陷入一个螺旋下降的怪圈中：更多的婴儿—更激烈的资源争夺—更加地动荡—更多的婴儿。
Some Africa-watchers fear that parts of the continent may be getting trapped in a downward spiral: more babies mean more competition for resources, more instability—and more babies.
一些非洲观察家担心非洲大陆的部分地区正在陷入一个螺旋下降的怪圈中：更多的婴儿—更激烈的资源争夺—更加地动荡—更多的婴儿。
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