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。
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。
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。
This danger will add to the cost and difficulty of 'delving' needed drains and channels.
这危险将增加的成本和'困难钻研'需要排水渠及渠道。
This danger will add to the cost and difficulty of 'delving' needed drains and channels.
这危险将增加的成本和'困难钻研'需要排水渠及渠道。
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