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- To move to and fro over; cross and recross. 迅速的来回或上下移动。
- He continued to move to and fro over the soft carpet. 他继续在柔软的地毯上来回走动。
- She was moving to and fro about her work, alert, joyous and robust. 她跑来跑去地干活，手脚轻健，兴高采烈，身强体
- Trucks shuttled to and fro on the high ways. 车辆在高速公路上穿梭行驶。
- He is walking to and fro in the room. 他在房间内踱来踱去。
- The ship was rolling heavily to and fro. 那船晃来晃去很不平稳。
- The signals go to and fro at a very high but almost constant speed. 那些信号用非常快但几乎不变的速度来回传送。
- It is a disc or collar with an irregularly shaped edge, which operates in contact with a rod or lever, and causes it to oscillate, or to move to and fro. 它是一个不规则形的圆碟或圆环，和一个杆或棒连接运作，使它上下或往来摆动。
- The cat made little rushes to and fro after the ball. 猫追着球跑过来跑过去。
- Now he felt weightless again and with an ever-so-slight motion of the tail he could move to and fro, up and down, as before. 现在，他重新感觉到身体轻飘飘的，尾巴稍稍一摆，他就能在水里游来游去，游上游下，和从前一样。
- Polybag sealer : No water need.Place the head and move to and fro on both side of the part where would like to be sealed. 胶袋封囗机： 不用加水，将清洗头在需密封的部位上、下两边来回轻压，大部份胶料也合用。
- The tall chimney tottered (to and fro) and then collapsed. 那座高烟囱摇摇晃晃地倒了下来。
- Buses go to and fro between the center of the city and the city limits. 公共汽车往返行驶于市中心和城市边缘之间。
- A few clouds of dust moving to and fro signify that the army is encamping. 少而往来者，营军也；
- Those boats are prepared for waftage to and fro. 那些船舶是准备用来来回运送货物的。
- Moving to and fro. 来来回回的移动
- The whole house rocked (to and fro) when the bomb exploded. 炸弹爆炸时整座房子都震得(前後)直晃。
- Cam: A device for converting circular or rotary motion into reciprocating motion. It is a disc or collar with an irregularly shaped edge, which operates in contact with a rod or lever, and causes it to oscillate, or to move to and fro. 凸轮:把旋转动力转为往复力的机件。它是一个不规则形的圆碟或圆环，和一个杆或棒连接运作，使它上下或往来摆动。
- People are hurrying to and fro in the street. 街道上人来人往。
- The crowd moved to and fro in the rooms like an ebb and flow of turquoises, rubies, emeralds, opals, and diamonds. 人群拥来拥去，象是一道由蓝宝石、红宝石、翡翠、猫眼石和金刚石组成的涡流一样。
