Parents should work as efficiently as two bookends.是什么意思？

Parents should work as efficiently as two bookends.

父母亲应合作无间,如同两个书档使书稳立不摇.

parents

n. 双亲（ parent的名词复数 ）；

例句
Some parents believe a boy must learn to stand up and fight like a man.
有些父母认为男孩子必须学会像男子汉一样顶天立地，勇于抗争。

should

应该，将会，可能，本应；

例句
The older child should be able to prepare a simple meal...
那个年纪稍大的孩子应当会做一顿简单的饭菜。

work

vt.& vi. 使工作，使运作，操作，使产生效果；n. 工作，操作，著作，工厂，行为，事业；vt. 使工作，操作，经营，使缓慢前进；

例句
Most people have very little difficulty in seeing why a Van Gogh is a work of genius.
多数人不难理解为什么凡·高的作品是天才之作。

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

efficiently

adv. 效率高地，有效地；

例句
A secretary can file papers as efficiently as a floppy disk can store them...
秘书归档文件时可以像软盘存储一样高效。

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。

bookends

N-COUNT 书挡;书靠；

例句
Between these Rumsfeldian bookends , scientific skepticism was rampant.
在知与未知之间, 正是科学怀疑论滋长之处.