foundation 用于具体意义时，侧重指坚固结实的建筑物的基础或地基;用作比喻意义时，与basis基本相同。
ground 含义与basis和foundation接近。一般指某种决定、论点或关系的基础，也可指某种原因的基础
base的例句：
1. The pizza base retains its crispness without becoming brittle.
比萨饼的饼底依然酥脆，也没有变得易碎。
2. Bank base rates of 7 per cent are too high.
7%的银行基准利率太高了。
3. The crime was so base that everyone wanted to hush it up.
这一罪行如此卑鄙无耻，大家都不想声张出去。
4. He was then taken by minibus to the military base.
他随后被一辆中巴车带到了军事基地。
5. Gunfire was heard at an army base close to the airport.
机场附近的军事基地传出了炮火声。