消失的第一天英文.

有两个理解

消失的第一天（我消失了，在第一天）
The fist day of my disappearance

消失的第一天（第一天不见了）
The first day which disappeared

The first day for disappear.

the first disapeared day

the first day of disappearance

这个要看语境的。

如果是人：the first day of your leaving

如果是物：the first day of disaperance