base 侧重指构成或支撑某一具体物体的基础，也可指军事基地或用作比喻意义。
basis 主要用作抽象或引申意义。
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。
参考例句
1. The U.S. squadron was based on the carrier. 美国空军中队以这艘航空母舰为基地。
2. This time our target is the ravine base. 这次我们的目标是这个峡谷基地。
3. The cabinet has crotched mahogany veneers on the base. 柜子的底座上有成分叉的红木饰面。
英英解释
n.
1. any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to f
2. installation from which a military force initiates operations
3. lowest support of a structure
4. place that runner must touch before scoring
5. (numeration system) the positive integer that is equivalent to one in the next higher counting place
6. the bottom or lowest part
7. (anatomy) the part of an organ nearest its point of attachment
8. a lower limit
9. the fundamental assumptions from which something is begun or developed or calculated or explained
10. a support or foundation
11. the bottom side of a geometric figure from which the altitude can be constructed
12. the most important or necessary part of something
13. the place where you are stationed and from which missions start and end
14. a terrorist network intensely opposed to the United States that dispenses money and logistical suppo
15. (linguistics) the form of a word after all affixes are removed
16. the stock of basic facilities and capital equipment needed for the functioning of a country or area
17. the principal ingredient of a mixture
18. a flat bottom on which something is intended to sit
19. (electronics) the part of a transistor that separates the emitter from the collector v.
1. use as a basis for; found on
2. use (purified cocaine) by burning it and inhaling the fumes
3. assign to a station adj.
1. serving as or forming a base
2. (used of metals) consisting of or alloyed with inferior metal
3. of low birth or station (`base' is archaic in this sense)
4. not adhering to ethical or moral principles
5. having or showing an ignoble lack of honor or morality
6. illegitimate
7. debased; not genuine
