translation.en: And then we put a lead, which is a wire, in the right ventricle inside the heart, which does the electrogram, which is the signal voltage from inside the heart.
translation.zh: 我们用一根电线连接在猪的右心房 而右心房直接与心电图机连接，从而能够看到心脏显示出来的电压信号。