Expert specialist in a heart specialist的用法和样例：
例句
- One heart expert thinks this study proides further eidence of the dangers of secondhand smoke.
一位心脏专家认为这一研究提供了间接吸烟危险性的进一步证据。 - Once the catheter is in the heart, the cardiologist will pass an inflated balloon through the narrowed section of the aorta to stretch the area open.
一旦导管进入心脏，心脏专家就把一个球囊导管通过主动脉的狭窄段，膨胀球囊使此处加宽扩大。
