...所有的目视飞行（VFR，Visual Flight Rules）航空器，包括滑翔伞，都被要求熟悉他们飞行路线沿线的飞行通报和临时飞行限制（TFRs, Temporary Flight Restrictions））。向报告人索取你飞行区域内的所有飞行通报和临时飞行限制。
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The TFRs with signal-dependent kernel can suppress and translate the cross-components, improve the readability and main performances.
基于信号的核函数的时频表示可以有效地抑制或转移交叉分量，提高时频表示的可读估计，改善其主要性能。
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But many developing countries have high TFRs, the largest of these being India, with its 2012 TFR estimated to be 2.6.
FORBES: Declining Populations Make Peaceful Neighbors
Africa has even higher TFRs, with many of its countries between 4 and 7, far higher than the replacement rate of 2.1.
Ireland and the U.K. also have high TFRs, at 2.1 and 1.9, respectively, but these rates are derived from non-European immigrant parents.
FORBES: Warning Bell for Developed Countries: Declining Birth Rates
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