steam up是什么意思？

steam up的音标：steam up的英式发音音标为：[sti:m ʌp]steam up的美式发音音标为：[stim ʌp]...

The engines were fired with coal and needed water to keep the steam up.这些发动机烧煤，并且需要加水以不断产生蒸汽。The treaty will steam up trade between the two countries.条约将促进两国之间的贸易.My breath had begun to steam up the windscreen.我的呼吸使挡风玻璃布...