The phrase "can only be retrieved" is grammatically correct and is commonly used in written English.
It is typically used to describe something that is only possible to obtain or recover through a specific means or method. Example: The lost documents can only be retrieved from the backup server.
The return is a Python object and can only be retrieved with pyret.
What was taken by force can only be retrieved by force".
Messages sent to an alumni.harvard forwarding address can only be retrieved through the address to which mail is being forwarded.
The songs can only be retrieved by fishing out a business card-size coupon from the package and entering a code into an unnecessarily byzantine Web site.
Practically, in GRO, the temperature and humidity variables in the troposphere can only be retrieved separately from refractivity by co-using a priori humidity and/or temperature information.
If a task is submitted defined as a Python callable then the return value can be any Python object and can only be retrieved with pyret.
The former can be accessed directly by explicit addresses and can be sorted; while the latter may only be retrieved by content-sensitive search and matching among neuron clusters with tree-form organization where spatial connections and configurations themselves represent information in such a partially connected memory system.
The above limitation is an important shortcoming of the current i2b2 data model, and due to this limitation, at the time of writing, individual clinical observations can only be stored and retrieved together at the level of a given 'encounter' or a 'visit' but not at the level of a series of atomic observations that were charted together to convey a clinical fact.
The order of Yahoo's results, however, can only be changed after they are retrieved (you cannot pass Yahoo parameters that tweak its standard relevancy model and return reordered results).
Satellite tags are now being deployed which can track megafauna for vast distances across the oceans [3], [4], and archival tags also collect amazing detail on animal movement particularly in relation to oceanography [5], [6], but that detail can only be obtained if the tag can be retrieved.
Likewise, the small number of src_compound_ids assigned to InChIKeys lacking corresponding InChIs will never be retrieved in a result set, because comparisons can only be made when both a Query InChI and a retrieved InChI exist.
