... optima enclosures ltd 奥普蒂马机壳公司 several enclosures in the envelope 装在信封内的几份附件 electromagnetic anechoic chamber 电磁无回声室, 电磁消声室 ...
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several enclosures in the envelope
信封里有几个附件
以上为机器翻译结果，长、整句建议使用 人工翻译 。
There are several enclosures in the envelope.
信封内装有几份附件。
youdao
There were several enclosures in the envelope.
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