The car-trading services provider reported a fourth consecutive quarter of revenue decline in the second quarter, as its gross margin plunged more than 10 percentage pointsKey Takeaways:Autohome's revenue fell about 6% in the second quarter, as Chinese car manufacturers and dealers slashed their advertising budgets amid a bloody price warThe company launched an international edition of its core car-trading platform in June, aiming to tap China's growing prowess as the world's top auto exporterChina's overhe ...