at long intervals 间或
- He was eating an apple, and giving a long, melodious whoop, at intervals, followed by a deep-toned ding-dong-dong, ding-dong-dong, for he was personating a steamboat.
他正在吃苹果,不时地发出长长的、听的“呜——”的叫声,隔会儿还“叮当当、当当”地学铃声响,他这是在扮演一只蒸汽轮船。
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