n. 事件;意外發(fā)生的事;
v. 發(fā)生(happen的現(xiàn)在分詞);碰巧;
?? hap(luck)+pen+ing(形容詞后綴)→事件
"The child at the back craned forward to see what was happening."
后面的孩子探出頭看看出了什么事.
近義:imminence, approach, incident, instance, arrival, occasion
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."
細菌一進入血液里,就附著在紅細胞表面上。
近義:heretofore, occasionally, onetime, previously, sometimes, thereinbefore
n. 時間;時刻;時代;次;
vt. 為…安排時間;測定…的時間;調(diào)準(zhǔn)(機械的)速度;撥準(zhǔn)(鐘、表)的快慢;
vi. 合拍;和諧;打拍子;
adj. 定時的;定期的;[美國英語]分期(付款)的;
int. [體育]時間到,(一場或一局等的)比賽時限,暫停;
"I can only carry two at a time."
我一次只能帶兩個。
近義:clock, lifetime, period, season, chapter, aeon