labor time variance是什么意思_翻译labor time variance的意思_用法？

as smart as a steel trap的中文翻译及音标【铿鸟百科网-英语百科频道】精选as smart as a steel trap是什么意思、英语单词推荐非常精明泼辣相似短语as smart as a steel trap非常精明泼辣have a mind like a steel