Relational calculus
[計(jì)] 關(guān)系演算
?? 詞語組成解析
relational
[ri'le??nl]
adj. 親屬的，相關(guān)的，有關(guān)的;
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)候用石頭來計(jì)算)##calc 石灰,石頭#詞根助記：calc石頭(古時(shí)候用石頭來計(jì)算)
??? 情景例句
Can I help?
要我?guī)兔幔?/div>
Would you please take a message?
請(qǐng)你代我留話好嗎？
My old friend, Harrison, had lived in the Mediterranean for many years before he returned to England.
我的老朋友哈里森在回到英國(guó)以前曾多年居住在地中海地區(qū)。