弹簧管的蜡烛火焰高度不变承保和最小的蜡泄漏。
The spring loaded candle tube insures a constant flame height and minimal wax spillage.
当它们需要转向的时候，它们会向一边略高地倾斜翅膀，这几乎不花费能量却能保持高度不变。
When they neededto turn, they would tilt their wings to bank higher, preserving the lift andusing almost no energy.
搅拌器，也叫“恐慌”，的动作指的是带着横滚的垂直俯冲，然后马上接能够保持高度不变的水平自旋。
The Blender, or Panic maneuver is a vertical diving roll that virtually stops its descent as it instantaneously enters into a flat spin.
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