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1. 夏天;夏季
Summer is the season between spring and autumn. In the summer the weather is usually warm or hot.

1. the period of finest development, happiness, or beauty

e.g. the golden summer of his life

2. the warmest season of the year
in the northern hemisphere it extends from the summer solstice to the autumnal equinox

e.g. they spent a lazy summer at the shore

Synonym: summertime