轻轻地浮动
to move up and down in a soft, non-violent way
以柔和、非剧烈的方式上下移动
轻微地浮动
to make a small or minimal up-and-down movement
做小范围或最低限度的上下移动
to move forward in a direction while bobbing, often with a current
四处浮动
to move around in a place while bobbing
在一个地方边上下浮动边移动
上下浮动
the characteristic and most common movement of bobbing
浮动的特征性和最常见的运动方式