Long experience of its use and improvement of its results make the calculation of the formula more reliable in safety and economy.

长期实践与计算结果证明，本文的计算方法和公式是有效的，是符合安全与经济要求的。

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Tests show that the bolting method is simple in technology, easy for construction, lower in cost and reliable in safety with remarkable economic and social benefits.

试验证明该支护方法技术简单，施工方便，成本低，安全可靠，具有显著的经济效益和社会效益。

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Sweden cars are extremely prestigious and reliable in the world for its preeminent safety performance, including SAAB.

瑞典制造的轿车在世界上最为有口皆碑的是其超群的安全性能，萨博也不例外。

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