字头Q

quality - n. that which something is known to have or be ("An important quality of steel is its strength."); amount of value or excellence ("Their goods are of the highest quality.")

question - v. to ask; to express wonder or disbelief; n. a sentence or word used in asking for information; a problem; an issue to be discussed

quick - ad. fast

quiet - ad. with little or no noise; having little or no movement; calm

字头R

race - v. to run; to take part in a competition to decide who or what can move fastest; to take part in a campaign for political office; n. one of the major groups that humans can be divided into because of a common physical similarity, such as skin color

radar - n. a device that uses radio signals to learn the position or speed of objects that may be too far away to be seen

radiation - n. waves of energy from something that produces heat or light; energy from a nuclear substance, which can be dangerous

radio - n. the system of sending and receiving signals or sounds through the air without wires

raid - v. to make a sudden attack; n. a sudden attack carried out as an act of war, or for the purpose of seizing or stealing something

railroad - n. a road for trains; a company that operates such a road and its stations and equipment

rain - n. water falling from the sky

raise - v. to lift up; to move to a higher position; to cause to grow; to increase

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