Usage note
按时意味着按照预定的时间去做某事。例如,按时完成作业意味着在规定时间内完成它。
àn shí yì nián kěng zé yào zhe yù dìng de shí jiān qù zuò mǒu shì . rú kě , àn shí wán chéng zuò yè miàn jǐng zài guī dìng shí jiān qū nán wán chéng tā 。
按时 means doing something at the scheduled time. For example, completing homework on time means finishing it within the specified period.