心跳加速 one's heart races
(1) race除了表示“比赛”，还表示“（心脏）急速跳动，（头脑）高速运转”
(2) one's heart races “心跳加速”，指紧张、兴奋等
(3) one's mind races “脑子飞速运转”
例
My heart began to race and my mind went blank.
我心跳开始加快，脑子里一片空白。
Seeing you in that dress makes my heart race.
香衣配美人，我心跳加速难自持。《破产姐妹》
心怦怦跳 one's heart leaps
(1) leap “跳跃；（心）猛跳”
过去分词有两种形式，美式英语leaped，英式英语leapt
(2) one's heart leaps “心怦怦跳”，指突然感到高兴，充满希望
例
Her heart leaps every time she thinks of marrying him next month.
每次想到下个月就要嫁给他，她就心如鹿撞。
His heart leaped the first time he saw Evelyn.
他第一次见伊芙琳，心就怦怦乱跳。
心往下沉 one's heart sinks
(1) sink “下沉，沉没”
(2) one's heart sinks “某人的心沉了下去，心情沉重”，指失去信心或希望
例
Her heart sank when she heard her son had a car accident.
当她听到她儿子发生了车祸，心直往下沉。
His heart sank when he realized he would have to walk home in the rain.
当他意识到他得在雨中走回家时，心情沉重。
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