American option or style的用法和樣例：
例句
- The numerical solution for pricing American options under stochastic volatility is considered.
摘要考慮隨機波動率下美式期權定價問題的數值模擬求解。 - This paper develops a trinomial option pricing model that incorporates the first four moments of the stock return distribution.
提出了一個將股票收益分佈的頭四個動差結合起來的三項式期權定價模型。
