Tang: Yes, it is necessary to investigate and deal with.

唐：是的，这是必要的调查和处理。

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Any other doubtful transaction, which it is reasonable to think that it is necessary to investigate and verify.

七其他有合理理由认为需要调查核实的可疑交易活动。

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It is necessary to investigate the dust weather in the past period in order to deeply understand the law of its emergence.

为了深入了解沙尘天气的发生规律，有必要对历史时期的沙尘天气状况进行研究。

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Tween Brands, another company contacted by investigators, said it had "recently learned that a decorative accessory attached to the outer packaging of some products may contain elevated amounts of lead, " and it is working with the council to investigate whether a recall is necessary.

CNN: More lead-paint toy recalls coming, source says