解析 Cron 表達式並用中文說明排程含義，快速理解定時任務語法。
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Field order:
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* * * * *
0 9 * * 1-5
30 6 1 * *
*/15 * * * *
0 0 * * 0
A: A string of 5 fields (minute, hour, day, month, weekday) that defines when a scheduled task runs.
A: * means "every" for that field — e.g., * in the minute field means every minute.
A: The slash notation means "every N units" — */5 in minutes means every 5 minutes.
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