Tā zài yǎnjiǎng zhōng chǎnshì le gōngsī wèilái de fāzhǎn zhànlüè.
In his speech, he expounded on the company's future development strategy.
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usage
阐释 is more formal and thorough than 解释 (jiěshì). 解释 is everyday explaining; 阐释 implies systematic, detailed exposition, often of academic, philosophical, or policy content.