foundation 用于具體意義時，側重指堅固結實的建筑物的基礎或地基;用作比喻意義時，與basis基本相同。
ground 含義與basis和foundation接近。一般指某種決定、論點或關系的基礎，也可指某種原因的基礎
base的例句：
1. The pizza base retains its crispness without becoming brittle.
比薩餅的餅底依然酥脆，也沒有變得易碎。
2. Bank base rates of 7 per cent are too high.
7%的銀行基準利率太高了。
3. The crime was so base that everyone wanted to hush it up.
這一罪行如此卑鄙無恥，大家都不想聲張出去。
4. He was then taken by minibus to the military base.
他隨后被一輛中巴車帶到了軍事基地。
5. Gunfire was heard at an army base close to the airport.
機場附近的軍事基地傳出了炮火聲。