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More permanent reference stations are being installed to provide wider and more precise coverage.
测绘处现正设立更多的永久参考站，以扩大覆盖范围及提高精确程度。
youdao
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More permanent reference stations are being installed to provide wider and more precise coverage.
测绘处现正设立更多的永久参考站，以扩大覆盖范围及提高精确程度。
youdao