HSK 7-9
长期以来
chángqī yǐláifor a long time
长期以来她坚持记录天气。
Cháng qī yǐ lái tā jiān chí jì lù tiān qì.
She has kept recording the weather for a long time.
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Appears across levels (7-9) in the HSK 3.0 word list.