allow的形容词
allowable adj. 承认的，容许的；免税的；
Capital punishment is allowable only under exceptional circumstances.
只有在特殊情况下才允许判死刑。
This settles the boat\'s share of the total allowable catch of that fish for the entire country.
这决定了这艘船在全国范围内，捕捞那种鱼的被允许的总捕获量的份额。
What exactly are the allowable values?
哪些值是真正被允许的？
Rules governing the allowable values of the type.
控制类型允许的值的规则。