英语翻译

题目

英语翻译
l know the days are gone when attendants could be written if we did not put the lines napkins with the TWA[Trans-World Airlines] logo in the lower right-hand corner of the first-class diners' trays.求翻译……

答案

我明白那样的日子已经一去不复返了,那时假如我们不把印有TWA（环球航空公司）标志的餐巾纸放在餐车托盘的右下角,乘务员就会被书面警告.
句子结构梳理：l know the days are gone |（后边是when引导的修饰days的定语从句） when attendants could be written ||（后边是if引导的条件状语从句） if we did not put the lines napkins （with the TWA[Trans-World Airlines] logo括弧内修饰napkins） in the lower right-hand corner of the first-class diners' trays.句子分成两层,一条竖线是一层,第二层是两条竖线.
另外一个小疑问,be written的意思我是猜的,