another 接 单数名词还是复数名词

都可以。

another译为：另一，又一
其后接单复数都可以如：1another book
2another bunch of flowers

都可以.如 another boy,another two hours

another用作形容词，表示：“另一个”或者“不同的”（相当于：one other XXX, one other different XXX)，一般修饰单数名词，如：
We went into another room. 我们进入另一个房间。
Sorry I am not very well. I will go and see them another day. 对不起我不太舒服，过几天我会去看他们的。
This route to Boston takes too long. There must be another route that is shorter. 这条到波士顿的路线太费时了，一定会有一条较短的路线。
有时也可修饰数词和复数名词（相当于 数字 more XXX），如：
He went back to work too soon, and was laid up for another three months. 他回去上班过早，结果又病倒了三个月。（three more months)
Another 50 yards farther on you can see his boat. 你再走人50码，就可以看到他的船了。（50 more yards)