Both atria are thinwalled muscular chambers.两心房是由薄壁构成的空腔.Yet on maximal vagal stimulation, both atria and ventricles come to a standstill.然而,以最大刺激作用于迷走神经时, 心房和心室都停搏.The combined contraction of the atria and ventricles is...
With the fourteenth century the real history of the European literature begins.欧洲文学的真正历史开始于14世纪.The Festival, now in its fourteenth year, has become a major international jazz event.这个艺术节现在进行到第14届，已经成为国际爵士乐的一大盛会。The four...