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- To bob or jerk(something)up and down or to and fro. 急动，上下晃动上下左右地摆动或推动（某物）
- To move or bob up and down jerkily and rapidly. 急动，蹦蹦跳跳突然地且迅速地上下运动或摆动
- To bob up and down. 上下摆动
- To bob or jerk(something) up and down or to and fro. 上下左右地摆动或推动（某物）。
- The boat bobbed up and down on the water. 小船在水面颠簸。
- Tiny boats bobbed up and down in the harbour. 一些小船在港湾中颠簸。
- The float bobbed up and down on the river. 漂浮物在江面上时上时下地浮动。
- The float bobbed up and down on the water. 漂浮物在水面上浮动。
- The little boat bobbed up and down. 小船一上一下地颠簸着。
- The cork on his fishing-line was bobbing up and down on the water. 他钩丝上的浮子在水面上下急动。
- She only saw a black eclipse bobbing up and down before her eyes. 她只看见一块黑影在她眼前一起一伏。
- The pillow moves with the waves.It bobs up and down. 枕头随着波浪移动，它忽上忽下地来回摆动。”
- The cork on his fishing-l was bobbing up and down on the water. 他钩丝上的浮子在水面上下急动。
- If we place a tiny boat at some fixed point in the pond, the boat will bob up and down rhythmically as the waves pass under it. 如果我们把一条小船固定在池塘某个位置，它就会随着船底下的浪有节奏地上下轻轻晃动。
- After a fellow gets famous it doesn't take long for someone to bob up that used to sit by him at school. 人在成名之后，不久就会忽地出现一个据说在学校里常与他同座的人。
- The cork on his fishing - line was bobbing up and down on the water . 他钩丝上的浮子在水面上下急动。
- They were jigging up and down to the music. 他们随着音乐的节拍轻快地上下跳着。
- The old man stared the uninvited guest up and down. 老人把不速之客上下打量了一番。
- He got up, and began to pace up and down the room. 他起身并开始在房间里踱来踱去。
- The float on a fishline bobs up and down when a fish grabs the hook. 鱼咬钩时，钩线上的浮子上下跳动。
