cascade stack级: level; rank; grade联: unite; join堆: pile up; heap up; stack级联: cascade connection; cascade tube; cascading; concatenation connection级联的级联: cascade of cascades下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:级联堆，即可在微信中查询翻译
