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1. Muscular motion is caused by the stimulate of specific nerve cells in the brain and spinal cor.(1)____
译文：肌肉运动是由大脑和脊髓中特定神经细胞的刺激引起的。
2. When does a neutron from one atom collides with the nucleus of another atom, a chain reaction can occur.(2)____
译文：当一个原子的中子与另一个原子的原子核相碰撞，就会发生链式反应。
3 The young of most bird species are totally dependence on parental care after hatching.(3)____
译文：大多数鸟类的幼鸟在孵化后完全依赖于父母的照料。
4. Jackie Mclean's recordings have shown that he is one of the few jazz musicians who style of playing has kept pace with the evolution of modem jazz.(4)____
译文：杰基·麦克林的唱片表明他是少数弹奏风格能跟上现代爵士乐发展的爵士音乐家之一。
n. 刺激，激励，鼓舞
