he·li·ot·ro·pism /ˌhiliˈɑtrəˌpɪzəm/
向日性,屈日性
he·li·ot·ro·pism /ˌhɪlɪˈɑtrəˌpɪzəm/ 名詞
向日性
He·li·ot·ro·pism n. Bot. The phenomenon of turning toward the light, seen in many leaves and flowers.
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heliotropism
n : an orienting response to the sun