one's heart misses a beat 心惊胆战；心怦怦直跳

【例句】
Mary's heart missed a beat when she heard her name callec out in the list of finalists.
当Mary听到自己的名字在入围名单中时非常兴奋，心怦怦直跳。

When the bear appeared in front of us, my heart misses a beat.
当熊出现在我们面前时，吓得我心脏怦怦直跳。