在冷战时期，这种微粒照相机是专门用来转移秘密文档的，它能够拍照，还可以将整本书的信息微缩到一张小小的胶片上。
Transferring secret documents during the Cold War was aided by this microdot camera that could photograph and reduce whole pages of information onto a tiny piece of film the size of a sentence period.
在冷战时期，这种微粒照相机是专门用来转移秘密文档的，它能够拍照，还可以将整本书的信息微缩到一张小小的胶片上。
Transferring secret documents during the Cold War was aided by this microdot camera that could photograph and reduce whole pages of information onto a tiny piece of film the size of a sentence period.
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