How to suppress shadow "index" warning?

如何抑制阴影“指数”的警告？

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The main Shanghai share index has entered a bull market, having rallied more than 20 percent from its lows in January, but trading volumes remain a shadow of what they were during the boom.

主要的上海股指已进入牛市，同1月的低点相比上涨逾20%，但交易量仍是繁荣时期的一小部分。

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