he looked as if...：此处as if引导的从句中，用的是暗喻辞格，讲his heart比作鸟，心飞出牢笼形容兴奋的心情。
"Oh,yes,Miss Oliver.I think I'll like teaching here,and the house is lovely,thank you,"I said. "If you like,I'll come and help you teach sometimes.Oh,Mr.Rivers,I am so tired! I was visiting friends,and I was out dancing until two o'clock this morning!How fun!" St.John looked straight into Miss Oliver's laughing eyes. He looked as if his heart wanted to fly out of its cage,but he said nothing. Miss Oliver went on talking, "Please come and visit my father,Mr.Rivers.Why don't you ever come?"she asked. "I can't,Miss Rosamund.I-- I am very busy with my work,"he said softly.