please summarize the following passage into under 100 wordsThe overall gross profit scale of Starbucks remains stable at a large volume but its volatility continues to increaseLooking closely at Starb

Starbucks' gross profit remains stable overall, but its volatility is increasing. The profit contributed by the Chinese market, considered Starbucks' most important profitable market, is lagging due to weak profit growth, resistance from local coffee and tea brands, food safety issues, and brand trust issues. The containment of the epidemic gave Starbucks a blow, and its competitors, such as Ruixing, have grown significantly. Starbucks' gross profit decreased significantly in 2020 due to the epidemic, and the impact on its gross profit is expected to be long-term and sustained. Starbucks may be pushed to transform due to the epidemic, and the impact on its gross profit from the Chinese market may be seen soon.