1. Ladies ride horses by sitting astride or side-saddle.
   女子骑马可以跨骑也可以坐横鞍.
2. To sit or stand on with the legs astride;straddle.
   跨坐两腿分开跨坐或站;跨坐
3. He sat astride his father's legs.
   他骑坐在父亲的腿上。
4. The bridge stands majestic astride the Yangtze River.
   这座大桥巍然横跨在长江之上。
5. Spurred riders sat astride sleek mares.
   装着马刺的骑手两脚分开跨在光滑的母马上

　2个副词解释