heart是不是可數(shù)名詞

　　It breaks my heart to see you like this.

　　看到你這個樣子我很難過。

　　It was clearly an offer that came from the heart.

　　那很明顯是由衷的提議。

　　His heart won't stand the strain much longer.

　　他的心臟對這種壓力承受不了多久。