cardiac sounds的用法和樣例：
例句
- The heart sounds are muffled when the pericardial sac is distended with fluid.
當心包充滿(mǎn)液體時(shí)心音減弱。 - Analyzing the rules of S1 variability and cardiac contractility variability may have practical linical value.It is worth to study further.
研究和分析第一心音幅值和心肌收縮能力的變異性可能有重要的臨床應用價(jià)值，值得進(jìn)一步研究。
