一个扑动周期内折叠翼能量耗损小于非折叠翼；
The flapping wing with a wing flexure consumes less energy than that without a wing flexure in a flapping cycle.
提出两个关系，即进动周期—绝对星等的关系和黑洞质量—进动锥角的关系；
Two correlations have been raised and sustained by observational values, which are precession period - absolute magnitude correlation and black hole mass - precession cone semi-angle correlation;
进动周期下限可能远小于真实进动周期，此时自相关法的估计性能将严重下降。
However, the lower bound of the precession period provided may be far less than the true precession period, which will seriously degrade the estimation performance.
应用推荐