ad.

1. （指空间；置于动词之后）向前；向前方；向外
   When we asked for volunteers, many young men came forth.

   当我们征求自愿者时，许多年轻人站了出来。

2. （指时间；置于名词之后）（从……）以后
   From this day forth I will work harder.

   从今以后我要更加努力地学习。

adv.

1. out and away from a starting point.
   ▸so as to be revealed.
2. onwards in time.