证券投资 Portfolio investment
Only when the fund is sufficiently large can it be used for portfolio investment.
只有当基金规模足够大时，才能用于证券投资。
Portfolio investment is investment made by investors who are not particularly interested in involvement in the management of a company.
那些对于参与公司管理不感兴趣的投资者，选择证券投资。
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