right field （棒球）右外场；
同义词：releasing factorreleasing hormone
a radioactive transuranic element which has been synthesized同义词：rutherfordiumunnilquadiumUnqelement 104atomic number 104
a complex neural network in the central core of the brainstem; monitors the state of the body and functions in such processes as arousal and sleep and attention and muscle tone同义词：reticular formation
rf amplifier射频放大器
rf energy射频能量