My grandfather passed away when I was fifteen.我爷爷去世的时候我十五岁
pass away:逝世
His mother passed away last year.
他母亲去年去世了。
That famous mathematician passed away yesterday.
昨天,那位著名的数学家去世了。
And then he just burst out laughing.后来他也大笑了出来
burst out:突然 ... 起来; 大声叫喊
He burst out crying like a child.
他像孩子一样忽然哭起来。
She burst out laughing and then checked herself.
她突然爆笑起来,然後又突然止住。
I just found out about the website,我只是刚刚才发现那个网站
find out:发现;找出来
We shall find out the truth early or late.
我们迟早会查明事实真相。