adv. 一次,一趟;一倍;曾经;一旦;
conj. 一旦…就…;一经;
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."
细菌一进入血液里,就附着在红细胞表面上。
近义:heretofore, occasionally, onetime, previously, sometimes, thereinbefore
adj. 确信的,确实的;有把握的;无疑的;一定的;
adv. 当然;确实地;无疑地;
"Make sure the shelf is aligned with the top of the cupboard."
务必使搁架与橱柜顶端对齐。
近义:inarguable, incontestable, incontrovertible, indefectible, indisputable, indubitable
反义:hesitant, hesitative, imprecise, improbable, inconclusive, indecisive