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Is such toughness necessarily a problem ?

这种一定韧性的需要是一个问题么？

This can build mental toughness seen in many elite athletes , but for coaches to do this successfully takes skill and individual knowledge .

一些杰出运动员身上可以看到，这可以建立心理韧性，但是教练成功的做到这些需要技巧和个人知识。

An understanding of economics is indeed important . So , too , is proven political ability , toughness and experience as a successful high-level policymaker .

懂经济的确很重要，经过验证的政治才能、韧性、以及曾成功担任高级别政策制定者的经验也十分重要。

Remember , herbert hoover didn 't have a problem making unpleasant decisions : he had the courage and toughness to slash spending and raise taxes in the face of the great depression .

请记住，赫伯特胡佛总统对痛下决心没有问题：在面对经济大萧条时他有勇气和韧性削减开支和提高税收。

The cast low alloy steel contains the alloy elements , such as manganese , chromium , copper , etc.this steel has high impact toughness , and has good usage property and long lifetime compared with the carbon steel .

低合金铸钢包含锰、铬、铜等合金元素，与碳钢相比，它具有韧性高、使用性能好和使用寿命较长等优势。