1) The global economy has experienced fluctuations and challenges, including the impact of the COVID-19 pandemic on businesses, supply chains, and employment, as well as efforts to address income inequality and promote sustainable economic growth.

2) The political system of the People's Republic of China is based on the Communist Party's leadership, with the General Secretary holding significant authority and influence over the country's policies and governance.

3) The first smartphone, the IBM Simon, was introduced in 1992 and featured a touchscreen, email capabilities, and apps such as a calendar and calculator.

4) Kimchi is a traditional Korean side dish made of fermented vegetables, primarily cabbage and radishes, seasoned with chili pepper, garlic, ginger, and other spices. It is a staple in Korean cuisine and is known for its tangy and spicy flavors. Kimchi is rich in vitamins, minerals, and probiotics, making it not only a delicious accompaniment but also a healthy addition to meals.