The Ace is not just popular, but profitable too: despite rising raw-materials costs and limited scale, it recouped its development costs within a year.

Ace 不仅很受欢迎，而且利润可观：尽管原料成本上涨，生产规模小，但仅一年就收回了开发成本。

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Here we examine the strikingly large global interannual variability of TC ACE during the past 40-years and shed light on the large-scale climate mechanisms responsible for the recent historical downturn in TC activity.

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