nervous ['nɝvəs] 词频2 词根: neuro

adj. 焦虑的;紧张不安的;神经质的;

💡 nerv神经 + ous ...的 → a.紧张的，神经的；易激动的

"Certain chemicals can induce undesirable changes in the nervous system."

近义：apprehensive, jittery, jumpy, scary, shy, skittish 反义：mild, pacific, peaceable, peaceful, placid, quiet

matter ['mætɚ] 词频1

n. 事件;（讨论、考虑等的）问题;重要性;物质; vi. 要紧，重要;化脓;有重大影响;有重要性;

"Now we come to the crux of the matter ."

近义：import, signify, weigh, count, amount, issue

sound [saʊnd] 词频1

n. 声音，声响;音调，声调;声波;嘈杂声; vi. 响，发声;听起来，好像;回响;[音乐]乐器等被奏响; vt. 使出声，使发声;清楚地发出;宣布，发表;颂扬; adj. 健全的;合理的;完好的，无损的;明智的; adv. 彻底地，充分地;

"I can't bear the sound of chalk scraping on a blackboard."

近义：plumb, probe, study, fathom, holler, scream 反义：imperfect, blemished, defective, dud, faulty, flawed

comes

v. 来自；从…来（come的三单形式）