course詞根

派生詞是詞根cours(去e)+詞綴ing，中文意思是n. 追趕奔馳攜帶獵犬狩獵

例如

He found that rats that exercise on a treadmill have raised levels of brain-derived neurotrophic factor coursing through their brains.

他發現，在跑步機上鍛鍊的老鼠，其大腦中流過的腦源性神經營養因子水平有所提高。