为什么glass half full 和glass half empty有乐观和悲观的意思?

为什么glass half full 和glass half empty有乐观和悲观的意思? is the glass half empty or half full? The glass was always half full,not half empty. glass-half-full是什么意思? Always try to see the glass half full是什麼意思 the glass is always half full "The glass is half empty." 在中如何理解? do people around your see a glass half empty instead of half full canvased,half canvased,和 half 英语翻译104集中：Well,aren't we Mr."The glass is half empty." 106集中 I try to be positive,I'm a glass half full as oposed to glas 翻译My father taught me to always look at the glass half full