Epicycloidal
圆外旋轮线的
🗣️ 情景例句
She is giving me piano lessons in exchange for her English classes.
我教她英语，她教我弹钢琴。
Ill news flies fast.
恶事传千里。
When their father died, they thought it their duty to keep Eric in hiding.
父亲死后，他们兄弟俩认为有责任继续把埃里克藏起来。