$RIVER 15分钟线有点猛啊，上下各一根长针

The text is already in simplified Chinese (zh-CN). Since you requested translation to ar-SA (Arabic - Saudi Arabia), here is the translation:

خط 15 دقيقة قوي جداً، إبرة طويلة واحدة لأعلى وأسفل

However, if you meant to keep it in Chinese or if this is the correct form, please let me know. The translation maintains the numeric placeholder and converts the candlestick/technical analysis terminology appropriately for Arabic-speaking traders.