spherical boiler

例句：

1. 1. Theplanet Mercury is known for its spherical shape.
   水星以其球形而闻名。
2. 2. The sphere of influence of thepresident is spherical.
   总统的影响力是球形的。
3. 3. The ball was sphericaland perfectly round.
   这个球是球形的，完美地圆。