亲眼所见

wǒ qīn yǎn suǒ jiàn

我亲眼所见。

I saw it with my own eyes.

chú fēi qīn yǎn suǒ jiàn fǒu zé wǒ yě bù xiāng xìn yǒu wài xīng rén cún zài

除非亲眼所见，否则我也不相信有外星人存在。

I won't believe there are aliens until I see them with my own eyes.