英文：He went through drawer after drawer and eventually searched out a dusty portfolio.
中文：他一個一個抽屜查找，後來終于找出了一份沾滿灰塵的文件夾。
英文：A mathematical measure of the sensitivity of rates of return on a portfolio or a given stock compared with rates of return on the market as a whole. A high degree of such sensitivity indicates moderate or high price volatility.
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