Such sentences are comparatively rare and the circumstances under which they occur have not been worked out. (from a Chinese grammar written in English) It means to be studied in enough detail to have a concrete explanation.
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contrapositionWhat does 'work out' here mean?Such sentences are comparatively rare and the circumstances under which they occur have not been worked out. (from a Chinese grammar written in English)It means to be studied in enough detail to have a concrete explanation.