VOA慢速英语:美国开始从叙利亚撤军

deliberate -v. done or said in a way that is planned or intended : done or said on purpose

reinforcements -n. people and supplies that are sent to help or support an army, military force, etc.

source -n. a person, book, etc., that gives information

protocol -n. a system of rules that explain the correct conduct and procedures to be followed in formal situations

procedure -n. a series of actions that are done in a certain way or order : an established or accepted way of doing something

mobilize -v. to make (soldiers, an army, etc.) ready for war

eliminate -v. to remove (something that is not wanted or needed)