Dental calculus
[醫(yī)] 牙垢, 牙結(jié)石
?? 詞語(yǔ)組成解析
dental
['dentl]
adj. 牙齒的;牙科的;（輔音）齒音的;
n. 齒音;
calculus
['k?lkj?l?s]
n. [醫(yī)]結(jié)石，石，積石，牙垢;[數(shù)]運(yùn)算，演算，微積分（學(xué)）;
ule,ulus 后綴;表”小,少”#詞根助記：calc石頭(古時(shí)候用石頭來(lái)計(jì)算)##calc 石灰,石頭#詞根助記：calc石頭(古時(shí)候用石頭來(lái)計(jì)算)
??? 情景例句
After he eats!
等他吃飽了！
I ought to go right away.
我應(yīng)該立刻去。
These?
這幾只？