The reason is that unemployment is falling not just because of job creation but because the pool of people who want to work, the Labour force, is not growing.

失业率下降的原因不是因为创造了就业机会，而是因为愿意工作的人群，也就是劳动力队伍，并没有扩大。

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Boethius describes their knowledge of sound in terms of waves generated by a stone falling into a pool of water.

波爱修斯把声音描述成一个掉进水池里的石头激起的波浪。

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When she is falling into the pool, a breeze holds her up.

在她掉入水塘时，一阵清风将她盈盈托住。

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The U.S. has a large pool of available labor, abundant raw materials and falling energy costs, said Paul van Eeden, president of Cranberry Capital, a private Canadian holding company.

FORBES: INTERVIEW: Cranberry Capital's Van Eeden Bullish On U.S., Crude Oil Price, Not Gold

However, this was suggested to be the result of the fact that so many in the key age groups carry the infection that in some countries, the "pool" of people at risk of infection is falling.

BBC: HIV cases set to soar