forth:
adv. 向前,向外;自…以后
From that day forth she never came out again.
从那天起,她再也没有出来过。
I came forth to take the air.
我出来透透气。
The old man paced back and forth restlessly.
老人不安地踱来踱去。
fourth:adj. 第四的,第四个的;四分之一的
n. 第四,月的第四日;四分之一
num. 第四This was their fourth successive win.
这是他们连续第四次获胜。
The lift bell pinged at the fourth floor.
该电梯铃在四楼发出响声。

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