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合格证书在英语中被称为“certificate of competence”或简称“certificate”。这个词源于拉丁语“certificare”，意为“证明”或“确认”。一些英文例句及其中文翻译如下：
"I have a certificate of competence in welding." (我有一个焊接合格证书。)
"You need to show your certificate of competence before you can operate the machinery." (你需要在操作机器之前出示你的合格证书。)
"The certificate of competence is a proof of your skills and qualifications." (合格证书是你技能和资格的证明。)
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