The installations tested were of two kinds, each in duplicate.
试验中采用的装置有两种，每一种两份。
Certificate of Quality and Quantity, each in duplicate, issued by the manufacturers (sellers).
由制造厂(卖方)签发的质量、数量证明书各两份。
We had to duplicate all applications for each release, with hundreds applications in each release.
我们必须为每个版本复制所有的程序，一个版本中有数百个程序。
应用推荐