n. 循环,周期;自行车;时代,一段时间;整套;
vi. 周而复始,循环;骑自行车;轮转;
vt. 运转,循环;使轮转;
cycl =ring,circle,表示”圆,环”
🗣️ 情景例句
Why not?
为什么不能?
Snowman
雪人
Up to now, historians have assumed that calendars came into being with the advent of agriculture, for then man was faced with a real need to understand something about the seasons.