The United States has expressed concern about an arms build-up in Venezuela saying it poses a serious challenge to stability.

美国对委内瑞拉的武器积累表示担忧。美国表示，这对稳定提出了一个严峻的挑战。

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Arms are a challenge because they make the robots more expensive, more difficult to use and less stable, analysts say.

分析师表示，机械手臂会使机器人的造价更高、使用上更困难、更不稳定，因此是一大挑战。

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Arms are a challenge because they make the robots more expensive, more difficult to use and less stable, analysts say.

分析师表示，机械手臂会使机器人的造价更高、使用上更困难、更不稳定，因此是一大挑战。

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