cr导程，胸右手导程（心电图）的英文

cr lead

• cr:    Cr ＝ Chromium.
• 导程:    helical pitch; lea ...
• 胸:    chest; bosom; thor ...
• 右手:    the right hand
• 导:    lead; guide
• 程:    rule; regulation
• 心电图:    electrocardiogram