不一定的用法和樣例：
例句
-
公共汽車星期日行駛不一定準能賺錢。
It is not always economic for buses to run on Sunday. -
能掙錢並不一定是衡量人生幸福的可靠標準。
Success in making money is not always a good criterion of success in life. -
輕型飛機飛行時起落架不一定縮回。
The undercarriage on light aircraft does not always retract in flight. -
憑本能行事不一定都對。
Instinct is not always a good guide. -
自由不一定包含著責任。
Freedom does not necessarily imply responsibility. -
財富並不一定會帶來幸福。
Happiness is not always annexed to wealth. -
逐字翻譯不一定最接近原義。
A literal translation is not always the closest to the original meaning. -
原始社會的結構並不一定就是簡單的。
The constitution of a primitive society is not necessarily simple.
