April 21 (Reuters) - The mainstream spot quotation range for toluene in East China is 6,920-6,950 yuan/ton, down from the previous trading day. Yesterday, the trading atmosphere in the Shandong regional market warmed up, with increased transaction volume, and production enterprises showed strong intentions to maintain prices. Externally, the US dollar quotations for MX and PX have declined, while international crude oil closed significantly higher. However, the boost to the spot market is limited, and it is expected that the short-term market will experience narrow fluctuations.