annular blast pipe

例句：

1. 1. The tree is annular in shape.
   这棵树是圆形的。
2. 2. Annular rings are found on the surface of many planets.
   许多行星的表面都有环状结构。
3. 3. The moon has annular craters that are visible from Earth.
   月球上有环形的陨石坑，从地球可以看见。