geotropism的音标：geotropism的英式发音音标为：[dʒi:'ɒtrəpɪzəm]geotropism的美式发音音标为：[dʒi'ɒtrəˌpɪzəm]...

The main stems of a plant show negative geotropism as they grow upwards.植物茎往上长时表现出负向地性....

n.向地性，屈地性...