The result shows that RTK technique is a good tool to heighten survey efficiency, especially in the difficult watching areas.

实践表明，RTK测量可以较大幅度提高工作效率，尤其在通视困难地区更具明显优势。

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But making the vaccine more widely available especially in rural areas has been difficult.

VOA: special.2009.11.03

In suburban and rural areas it can be especially difficult for the public to know where to turn for warning messages.

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"Bot-herders and other 'spam kings' are difficult to track down, especially in so many different jurisdictions and areas around world, with no enforced policies against them, " Manky observes.

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