... at a signal在信号发出时 begin at a signal在信号发出时开始 ask by signal用信号发问 ...
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begin at a signal
从信号处开始
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In The Warren Buffetts Next Door by Forbes Investments Editor Matt Schifrin, you can take a look at the chart work I used back then as my signal to begin accumulating mining stocks.
FORBES: A Gold Chart Only Benoit Mandelbrot Could Love
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