will all but disappear中but是什么用法

问题描述:

will all but disappear中but是什么用法
原句是Their research suggests that if these outbreaks continue,then local populations of wild pink salmon will all but disappear.

副词all but英英:(of actions or states) slightly short of or not quite accomplished几乎(差一点) 的意思.如:The car all but ran over him.车子几乎把他撵过去.The party was all but over when we arrived.我...