One of the great things about walking outdoors is that you can use hills and steps to add some difficulty, thus burning more calories, and toning your muscles.

户外步行的一个难得好处就是，您可以利用户外的小山、台阶来给自己身体增加难度，从而燃烧更多的卡路里，并调节肌肉。

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In addition, HR organizations also have the difficulty in proving how their activities and processes add value to the company.

此外，人力资源组织，也有如何证明他们的活动和流程增加价值的公司困难。

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These factors add difficulty to the early diagnoses of pneumoconiosis.

这些因素给尘肺的早期诊断带来了难度。

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Add to that the difficulty of obtaining even the most basic information about listed Asian companies.

ECONOMIST: Asia��s stockmarket nightmare

If we add greater uncertainty, as reflected by the distribution of the new normal, to the mix, then the difficulty of investing based upon economic forecasts is likely to be squared!

FORBES: Forget New Normal, Old Rules Are Alive And Well