1) 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.

2) The Atlantic Ocean is the second-largest ocean and is known for its strong ocean currents, including the Gulf Stream.

3) The word "triangle" contains four vowels: I, A, E, and E.

4) The first sound film, "The Jazz Singer," was released in 1927 and marked the transition from silent movies to "talkies."