英式：[ˈhɑːtɪŋ]美式：[ˈhɑːtɪŋ]
n.石墙填心石块
We had better learn by heart as many sentence patterns as we can. 我们最好尽可能多背句型。
Slowness of the heart rate, usually fewer than60 beats per minute in an adult human being. 心搏缓慢心律缓慢，通常指成人心跳低于60次每分钟
