1. to and fro 来回地
The girl's pigtails swing to and fro as she runs.
小女孩一跑, 辫子就来回甩动。
2. come forth 出来；涌现；被公布
She had come forth the winner.
结果她成为了优胜者。
3. prey upon 掠夺，折磨；捕食
Jaguars are still hunted for their attractive fur. Ranchers also kill them because the cats sometimes prey upon their livestock.
美洲虎有着吸引人的皮毛，因而仍旧被捕猎着。由于它们有时捕猎家蓄，农场人员也会猎杀猎杀它们。
4. stretch out 伸出；伸直四肢
Broad prairies stretch out as far as the eye can see.
辽阔的草原一望无边。