This could eventually present a challenge for the West, says Bitzinger.

Bitzinger表示，这对于西方来说可能最终是个挑战。

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Mobile devices can present a challenge to users wishing to recall all copies of a message.

移动设备给希望收回消息所有副本的用户提出了挑战。

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They present a challenge to mental health professionals who have to assist the traumatized population.

这些灾难对于那些去帮助心理受损人群的心理健康专家来说是一项挑战。

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The new company is still much smaller than Zynga by number of users but could present a challenge to the industry leader.

FORBES: Lolapps Merges With 6Waves In Social Gaming Developer-Publisher Tie-Up

Cybercrime is cross-border by nature, a situation that can present a challenge to national police forces, according to the head of the centre, Troels Oerting.

BBC: Brussels to open Europol cybercrime hub

In this regard, cybersecurity products and services present a challenge because the exports may contain a mixture of different software, encryption functions, and controlled technical information.

FORBES: The Cybersecurity Market And Dangers Of U.S. Export Law