Since the severity of collisions and derailments increases with speed, safety performance targets for preventive measures are tiered to become more stringent as speed increases.

速度越快，列车碰撞和出轨的后果就越严重，因此，在速度加快的同时，出台着重于预防措施的安全性能条例可谓迫在眉睫。

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London: British experts yesterday called for tougher measures to improve the safety of clinical trials, including more stringent criteria for testing new drugs in humans.

伦敦：昨日英国专家提出要采取更严格措施来提高临床试验安全性，这包括对人体新药试验采用更严格标准。

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Barrichello has led the calls for more stringent safety measures to be looked into.

BBC: Massa set to fly home to Brazil

The Commission wants a new directive, less strict - whilst opinion in the Parliament is for more stringent health and safety measures.

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