What are the coordinates for that event?

这个事件的坐标是什么呢
According to me,

对我而言
that event occurred at x=0

那个事件发生在 x=0 的位置
and the time was chosen to be zero.

并且时间被设定为零
According to you,

对你而言
your origin was also on top of my origin,

你的原点就在我的原点上
so x'=0 and the time is just the time.

因此 x'=0 时间也就是这个时间
Everybody has a single time,

大家都只有一个时间
and that time is called zero.

这个时间就是零时刻
That is one event.

这就是一个事件
We made the coordinate of the event (0,0) for both you and me.

我们把你我的事件坐标都设为 (0,0)
It is zero in space because my origin crossed your origin.

空间坐标为零因为我们的原点重合