spiral arm

例句：

1. 1. The surgeon used a surgical microscope to perform the delicate task of removing a tumor from the patient's spinal cord.
   外科医生使用手术显微镜完成了从病人脊髓中移除肿瘤的精细任务。
2. 2.In the construction of the bridge, the engineer had to design a spiral arm that would support the weight of the tower and allow for easy access to the upper levels.
   在桥梁的建设过程中，工程师必须设计一个螺旋臂来支撑塔楼的重量并方便上下层之间的通行。
3. 3. The scientist discovered a new species of fish by studying the behavior of its spiral arms, which are uniquelyadapted for capturing prey in the water.
   科学家通过研究其独特的行为特征发现了一种新的鱼类物种，这些特征使得它的螺旋臂非常适合在水中捕捉猎物。