kàn / zhe / chuāng / wài / de / jǐng / sè / wǒ / bù / jīn / gǎn / tàn / dǒu / zhuǎn / xīng / yí / shì / shì / biàn / huà / zhēn / kuài

看着窗外的景色，我不禁感叹斗转星移，世事变化真快。

Looking out at the scenery, I could not help reflecting on how quickly time and circumstances change.