![Wehaveknownforalongtimethatflowersofdifferentplantsopen...]( "Wehaveknownforalongtimethatflowersofdifferentplantsopen...")
- 问题详情：Wehaveknownforalongtimethatflowersofdifferentplantsopenandcloseatdifferenttimeofday.Thisissofamiliarthatthereseemstobenoneedtoaskthereasonforit.Yetnoonereallyunderstandswhyflowersopenandcloselikethisatparticulartimes.Theprocess(过程)isnotassi...
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