The compound material of resin matrix may produce serious smirch phenomenon during the minute hole drilling.
以树脂为基体的复合材料在微孔加工中会产生严重污斑现象.
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"he had a smudge on his cheek"
"he made a huge blot on his copybook"
"The journalists have defamed me!" "The article in the paper sullied my reputation"
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