combine model的用法和样例：
例句
- A utility maximization model of the investment portfolio including risk-free asset is put forward, with short sales allowed.
摘要提出了在允许卖空情况下含有无风险资产且借贷利率不同的效用最大化的投资组合模型。 - 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.
神经元组合模型因为可以产生能够否证的假说，且可解释意识相关的许多不同现象，想必会变得格外有用。
