3. From a testing perspective, the waterfall model offers one huge advantage over the other models presented so far. 测试界有这么一种观点，“瀑布模型”相对于现今其它的模型有着巨大的优势。
英英解释
n.
1. the smallest whole number or a numeral representing this number
2. a single person or thing adj.
1. used of a single unit or thing; not two or more
2. having the indivisible character of a unit
3. of the same kind or quality
4. used informally as an intensifier
5. indefinite in time or position
6. being a single entity made by combining separate components
7. eminent beyond or above comparison
