efficient investment的用法和樣例：
例句
- How could an investor identify the best of a set of efficient portfolios of common stocks?
投資者如何能夠辨別出普通股有效投資組合集中最優的那個？ - In addition, centered ownership structure neither constrains overinvestment nor promotes the effective investment in non-state-holding enterprises.
此外，居中的股權結構既不能抑制非國有控股企業過度投資，又不能促進企業有效投資。
