未必的

The constitution of a primitive society is not necessarily simple.

原始社会的结构未必简单。

The high tax policy is certainly unpopular, although it's unlikely to meet the soaring armament expenditures.

政策肯定是不受欢迎的，但也未必能满足飞涨的军备开支。

All that glitters is not gold.

[谚]发的东西未必都是黄金。