jerk up and down
造句带翻译释义:1.erect tropical Asian shrub whose small lateral leaflets rotate on their axes and jerk up and down under the influence of sunshine.热带亚洲的一种直立灌木，在阳光的作用下、它的侧生小叶上下震摇而且在其茎轴上旋转。
2.The plant has the amazing ability to shake its leaves (which rotate on their axis and jerk up and down).这种植物有着近乎神奇的能力使它的叶片摇动，（叶片围绕其茎轴旋转并上下震摇）。