Nvidia’s stock declined more than 5 per cent in after-hours trading on Thursday after it detailed challenges and uncertainties in the China market, despite robust quarterly financial results.Shares of the US semiconductor giant closed flat at US$181.6, but dropped as low as US$172.45 after posting revenue growth of 56 per cent to US$46.7 billion for the three months that ended July 27. However, revenues from China, including Hong Kong, declined 24 per cent to US$2.8 billion, according to its...