What made Du succeed in building her ROV?

是什么让杜成功建造了她的ROV？

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Mr Heydon says it is because the ROV technology has only recently become capable enough.

海登说，这是因为ROV技术只是在最近才得以真正用于实战。

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Mr Heydon says it is because the ROV technology has only recently become capable enough.

海登说，这是因为ROV技术只是在最近才得以真正用于实战。

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