... extension ring近摄接圈 external metering外测光 extra wide angle lens超广角镜头 ...
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external l metering 外测光
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A corrosion leakage occurred almost every 3.5 days on average based upon the statistics of 9 metering stations in an oil field, in which the external corrosion was the most remarkable.
对某油田9个计量站的调查统计，平均每3.5天就有一处发生腐蚀泄漏，其中以外腐蚀最为突出。
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