semi-spherical tip

例句：

1. 1.The shape of the car's wheel is a semi-spherical tip.
   汽车轮子的形状是一个半球形尖端。
2. 2. The camera lens has a semi-spherical tip to focus on objects close by.
   相机镜头有一个半球形尖端，可以聚焦在附近的物体上。
3. 3. The scientist used a semi-spherical tip to drill into the rock.
   科学家使用一个半球形尖端钻入岩石。