Arthur Robert Ashe Jr. was the first African-American player to take part in the international sport of tennis at the highest level of the game. He was born on July 10, 1943.
When Arthur was 6, his mother died. Arthur, with his father and his brother, lived near a large park in Richmond, Virginia. His father was the manager of the park. He took care of the park and made sure everything was right.
Arthur was allowed to play in the park when he was seven years old. He was quite energetic. A swimming pool, tennis courts, and baseball diamonds (棒球场) were in the park. Arthur spent a lot of time playing there. He did well in sports, but he had never tried to play tennis.
He often watched the tennis players. Sometimes there were tennis lessons, and Arthur would watch even more carefully. The young man teaching the lessons noticed Arthur. His name was Ronald Charity.
Mr. Charity asked Arthur if he wanted to learn to play tennis. Arthur was excited and agreed. Arthur learned very quickly. Mr. Charity found Arthur would grow up to be a good tennis player. By the time he was ten, Arthur won a tournament (联赛). Many older and bigger players came to the park trying to win the prize, but Arthur beat them. He became known as “the kid who could play tennis”.
Arthur grew up to be one of the first successful African-American tennis players. He played and won all over the world.
在密闭容器中反应，达到平衡状态的标志是（ ）
