under one's very eyes
親眼所見A:I heard several people were killed in the car accident.
A:我聽説那場
車禍中死了好幾個人。
B:Twelve, to be exact.
B:確切地説,是十二個。
A:How do you know it so clearly?
A:你怎麼知道得這麼清楚?
B:I was walking along the road that day. So it happened under my very eyes.
B:那天,我正好在街上,所以碰巧都看見了。