底部滑移，也通常被称为滑动，大致指的是冰川在基岩上的滑动，实际上是在基岩上部的一层薄薄的水上的滑动。
Basal slip or sliding as it's often called, basically refers to the slipping or sliding of a glacier across bedrock, actually across a thin layer of water on top of the bedrock.
所以这里是滑移和滑动，而不是纯滚动的情况。
So then we have skidding and we have slipping and then we don't have the pure roll situation.
PH值滑动剂应用于丝光羊毛和锦纶的酸性染料、活性染料、媒介染料或金属络合染料的染色，可使染浴的PH值从中性向酸性滑移。
PH value of sliding agent in mercerized wool and nylon acid dyes, reactive dyes, mordant dyes or metal complex dyes for dyeing, dye bath can aptitude acidic PH value from sliding.
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