Definition
一天 literally means 'one day', but as a fixed expression it often functions adverbially to emphasize the entire duration from morning till night ('all day long'). It is also used narratively to introduce a specific time in the past ('one day...'), and in literary contexts it can describe the whole sky covered with something (e.g., 一天星星 'a sky full of stars'). When used as a noun, it simply refers to a 24-hour period.
f.e.
(fixed expression / adverbial) all daythe whole day
noun
one day (as a time period)
Examples
- 。Tā yī tiān dào wǎn dōu zài gōngzuò.He works from morning till night.
- 一天，。yī tiān, wǒ zài gōngyuán lǐ sàn bù shí yù dào le lǎo péngyou.One day, I met an old friend while walking in the park.
- 一天，。Tiān shàng yī tiān de xīngxing, fēicháng piàoliang.The whole sky is full of stars; it's very beautiful.
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