太河源出清泉.Rivers need a spring.河源区水土流失受自然因素和人类不合理开发利用因素联合控制,但后者的作用更为重要,而且导致了河源新的危害性更大的水土流失类型.Mechanism of soil erosion is put a bridle on spontaneous factor and action of humanity.你也可以去参观河源博物馆, 在那里你可以看到许多恐龙蛋化石.You can also ...
Then the pigeons flew into thick fog, and the famous homing instinct failed.然后鸽子飞进了浓雾中,其闻名的归巢本能丧失了。Instinct led the pigeons back to the roost.鸽子的本能使它们返回鸽棚.When Alfred Adler first postulated in 1908 that there existed an ...