Left-handers are more competitive than right-handers. Most people are right-handed, but 10.6% are left-handed. Left-handers are rarer than right-handers, making their attacks in a combat situation more surprising than those of right-handers. This may help explain the evolution of left-handedness.
it may be perceived what manner of life there would be, where there were
，更多细节参见snipaste截图
$$W’ = W + U\Sigma(\sum_{i=1}^{u}v_{i}P_{i})V^{\top}$$
俄军工兵将研究配备美制C-4炸药的“标记”装置14:57
Прогноз погоды в Москве на День смеха обещает тепло20:55