combine model的用法和樣例：
例句
- A utility maximization model of the investment portfolio including risk-free asset is put forward, with short sales allowed.
摘要提出了在允許賣空情況下含有無風險資產且借貸利率不同的效用最大化的投資組合模型。 - The assembly model's ability to generate falsifiable hypotheses and account for the diverse range of phenomena related to consciousness surely makes it particularly powerful.
神經元組合模型因為可以產生能夠否證的假說，且可解釋意識相關的許多不同現象，想必會變得格外有用。
