spring指哪几个月？
一般词典上就说介于winter和summer之间，无法得知确切月份。spring一般指哪几个月？ definiton in OED:
The first season of the year, or that between winter and summer, reckoned astronomically from the vernal equinox to the summer solstice; in popular use in Great Britain comprising the months of February, March, and April, in U.S. March, April, and May. Also transf., a season resembling this in some respect.
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