时而
shíér
occasionally; from time to time
In a story
“这条河时而平静，时而发怒。”“This river is now calm, now furious.”听河的人 · The Man Who Listens to the River · HSK 6
那以后的半年里，那一天时而在她的梦里出现，时而在她工作的时候出现。For six months afterwards, that day came back to her sometimes in her dreams, sometimes while she was at work.记忆商店 · The Memory Shop · HSK 6
Grammar with 时而
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