You can use it as activity indicator during loading.

你可以用它在加载期间活动指示器。

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Usually the activity indicator shows at least one spontaneous urgent meeting by now.

通常的活动指标表明，目前至少有一个突发的紧急会议。

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Because you are done receiving data from the server at this point, your request is complete and you can turn off the network activity indicator, as listing 4 demonstrates.

由于现在已经从服务器接收完数据，请求就完成了，可以关闭网络活动指示器了，如清单4所示。

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The Philadelphia Federal Reserve's February index of business activity, an indicator of business conditions for manufacturers in the region, posted a surprise decline to -12.5, while a positive reading had been expected.

WSJ: Stocks Extend Declines

Manufacturing activity, a major indicator of economic vitality and recovery, peaked in February, and has eased significantly ever since.

FORBES: Recessionary Differentiations

China's official Purchasing Managers' Index (PMI), a key indicator of activity in the sector, stood at 50.6 in December.

BBC: Asian shares rise as US House passes fiscal-cliff deal