第二心音 meaning in English

second heart sound
second sound

Second heart sound
第二心音
Every cardiac cycle , can appear 4 heart sounds , namely sound of of one mind , disloyalty sound , the 3rd heart sounds and the 4th heart sounds
每个心动周期，可以出现四个心音，即第一心音，第二心音，第三心音和第四心音。
But most what often hear is sound of of one mind and disloyalty sound ; the 3rd , the 4th heart sounds can be not heard , hear below certain circumstance sometimes the 3rd or the 4th heart sounds often has pathology sense
但最常听到的是第一心音和第二心音；第三、第四心音并不能都听到，有时在某些情况下听到的第三或第四心音常有病理意义。
Former for sound of of one mind , basically originate systaltic when the oscillatory ; latter that mitral valve and tricuspid shut generation is disloyalty sound , basically originate diastolic when the vibration that aorta valve and pulmonary artery valve shut a generation
前者为第一心音，主要来源于心脏收缩时二尖瓣和三尖瓣关闭产生的振动;后者为第二心音，主要来源于心脏舒张时主动脉瓣和肺动脉瓣关闭所产生的振动。