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单词 gravitropism
释义
gra·vit·ro·pism (grə-vĭtrə-pĭzəm)
n.
Growth or movement of a sessile organism in response to gravity, as the downward growth of plant roots. Also called geotropism.

[GRAVI(TY) + -TROPISM.]

gravi·tropic (grăvĭ-trōpĭk) adj.
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