Investors hope for a turnaround in the company's business prospects despite its high P/S ratio and declining revenue. However, continued revenue trends could significantly impact the share price, posing a risk to investments.

High price-to-sales ratio amidst dipping revenues hints investors' hopes for future business prospects. However, with sustained medium-term revenue trends, there's a looming risk of share price drop.

Despite recent stock gains, Shanghai LongYun might face risk due to consistent revenue decline. High price-to-sales ratio seems overvalued; tread with caution as future price correction could align with revenue trends.