B2 [ I or T ] to (cause to) move easily and without interruption over a surface（使）滑动，（使）滑行

[ I ] to go into a worse state, often through lack of control or care下滑；衰落；逐渐陷入

[ C ] a sudden movement of a large mass of mud (= wet earth) or rock down a hill山崩，岩崩；崩塌

[ C ] a structure for children to play on which has a slope for them to slide down and usually a set of steps leading up to the slope滑梯

a part that moves easily backwards and forwards on an instrument or machine（乐器或机器上的）滑动件

[ C usually singular ] the process of moving into a worse state, often through lack of control or care（通常因为缺乏管理或关注而）不知不觉陷入（恶劣的状态）

[ C ] a small piece of photographic film in a frame that, when light is passed through it, shows a larger image on a screen or plain surface幻灯片

[ C ] a small piece of glass on which you put something in order to look at it through a microscope（显微镜的）载物玻璃片

[ C ] UK short form ofhair slide (女子戴的）小发卡（hair slide 的简称）