Polyhedra
polyhedron 的复数
🗣️ 情景例句
It was a gradual process, involving many factors.
这是个渐进的过程，涉及到方方面面。
A squirrel cracks the nuts.
松鼠在啃坚果.
For one thing they keep the water clean.
一来，水下植物可以保持水的清洁。