Take the nodong dam reinforcement project as an example, this paper introduced the application of clay curing agent in the cut-off wall of earth dam reinforcement.

以芦洞水库大坝除险加固工程为实例，介绍了粘土固化剂防渗墙在土坝加固中的应用。

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But a nuclear warhead would have to be small enough to fit onto, say, a Nodong missile - and it would have to be capable of withstanding the buffeting and other forces exerted on it during flight.

BBC: North Korea nuclear test raises uranium concerns

The designs themselves, suggests Gary Samore of the International Institute for Strategic Studies in London, may, like the North's uranium-enrichment technology, have come originally from Pakistan, whose uranium-based warheads are already fitted on North Korean Nodong rockets as part of Pakistan's nuclear force.

ECONOMIST: Peace or war on the Korean peninsula