n. 機(jī)會;適當(dāng)?shù)臅r機(jī)良機(jī);有利的環(huán)境,條件;
?? op=ob靠近 + portun=harbor港口+ ity 表名詞 → 向港口靠近 →機(jī)會
"He took the opportunity to deliver us another snub."
他借機(jī)再次冷落我們.
近義:instance, occasion, case, episode, event, happening
反義:hindrance, hitch, knot, misadventure, mishap, obstacle
adv. 一次,一趟;一倍;曾經(jīng);一旦;
conj. 一旦…就…;一經(jīng);
n. 一次,一回;
?? on=one一+ce次 → 一次
"Once in the bloodstream, the bacteria adhere to the surface of the red cells."
細(xì)菌一進(jìn)入血液里,就附著在紅細(xì)胞表面上。
近義:heretofore, occasionally, onetime, previously, sometimes, thereinbefore