The phrase "in two copies" is correct and usable in written English.
You can use it when referring to duplicate copies of something, such as documents, reports, or letters. For example, "Please print this document in two copies and bring it to the meeting."
Be sure to bring in two copies of the thesis grade sheet if you want a receipt, so that we can stamp your copy.
Our teacher brought in two copies of the magazine and allowed anyone who hadn't read it to borrow one.
Infinium assay intensity data suggested that 2991 polymorphic SNPs were single copy and another 952 polymorphic SNPs were present in two copies.
Second, activation in G2/M when the genome is present in two copies may yield an increase in the number of SCRaMbLE-mediated duplication events.
Done in Lisbon in two copies, in Portuguese and English, both texts having equal value, this sixth day of September 1951.
Please bring in TWO copies of the list of sources you plan to use for your project, and email us a copy.
For example, carrier testing is used to identify people who carry one copy of a genetic mutation that, when present in two copies, can cause a genetic disorder.
Looking at lot No. 418, it was difficult to imagine who might be interested in two copies of "Patton's 1991 Fantasy Baseball Price Guide".
In eukaryotes, while mRNA can be produced in two copies per hour, dozens of the corresponding protein can be translated in the same time [16, 17].
This book is extremely rare, known only in two copies: one is in the Brukenthal Museum in Sibiu, Romania, whilst another is in the Bibliothéque Nationale in Paris.
Studies of gene activity in this and other vertebrates also revealed that there is a key gene in the vertebrate lung that exists in two copies in salamanders.
