Martin Luther King marked in elementary school in Washington D.C.

A student of Watkins Elementary School participates in the 13th annual reading of Martin Luther King's "I Have a Dream" speech event at Lincoln Memorial in Washington D.C., capital of the United States, on Feb. 24, 2017 to commemorate the civil rights leader. (Xinhua/Bao Dandan)

People participate in the 13th annual reading of Martin Luther King's "I Have a Dream" speech event at Lincoln Memorial in Washington D.C., capital of the United States, on Feb. 24, 2017 to commemorate the civil rights leader. (Xinhua/Bao Dandan)

Students of Watkins Elementary School participate in the 13th annual reading of Martin Luther King's "I Have a Dream" speech event at Lincoln Memorial in Washington D.C., capital of the United States, on Feb. 24, 2017 to commemorate the civil rights leader. (Xinhua/Bao Dandan)

A student of Watkins Elementary School participates in the 13th annual reading of Martin Luther King's "I Have a Dream" speech event at Lincoln Memorial in Washington D.C., capital of the United States, on Feb. 24, 2017 to commemorate the civil rights leader. (Xinhua/Bao Dandan)

Students of Watkins Elementary School participate in the 13th annual reading of Martin Luther King's "I Have a Dream" speech event at Lincoln Memorial in Washington D.C., capital of the United States, on Feb. 24, 2017 to commemorate the civil rights leader. (Xinhua/Bao Dandan)

Students of Watkins Elementary School and their teacher participate in the 13th annual reading of Martin Luther King's "I Have a Dream" speech event at Lincoln Memorial in Washington D.C., capital of the United States, on Feb. 24, 2017 to commemorate the civil rights leader. (Xinhua/Bao Dandan)

Students of Watkins Elementary School participate in the 13th annual reading of Martin Luther King's "I Have a Dream" speech event at Lincoln Memorial in Washington D.C., capital of the United States, on Feb. 24, 2017 to commemorate the civil rights leader. (Xinhua/Bao Dandan)