first night duty：夜頭更

first line support 第一線支援 | first night duty "夜頭更" | first offender 初犯者

first obstruction：第一障礙類

first mean value theorem 平均值定理 | first obstruction 第一障礙類 | first order theory 一階理論

first obstruction：第一障礙

初除子式;第一個(gè)子行列式 first minor | 第一障礙 first obstruction | 第一卦限 first octant

first of all：首先,第一

first and foremost 首要地,首先 | first of all 首先,第一 | first or last (古)遲早,早晚

first offender：初犯者

first of all 首先 | first offender 初犯者 | first or late 遲早

first one and then the other, then the first again, etc; alternately：交替地;輪流地

in turn as a result of sth in a series of events 轉(zhuǎn)而;反過... | first one and then the other, then the first again, etc; alternately交替地;輪流地 | Sam and I rode the bike in turn. 我和薩姆輪著騎自行車...

first or last：[古、罕]早晚, 遲早

first of all 第一, 首先 | first off 馬上, 立刻 | first or last [古俄欧美激情A片在线观看、罕]早晚, 遲早

first or last：遲早,早晚

eg:He was a real gentleman,first and last.從各方面來看,他都是個(gè)正人君子 | first or last 遲早,早晚 | from first to last 自始至終,一貫

It doesn't matter whether it's done first or last, as long as it's done：只要做這件事就行,遲點(diǎn)早點(diǎn)沒關(guān)系

first or last遲一點(diǎn)或者早一點(diǎn): | It doesn't matter whether it's done first or last, as long as it's done. 只要做這件事就行,遲點(diǎn)早點(diǎn)沒關(guān)系. | first thing首先要做的事:

first order spectrum：第一級(jí)光譜

first order reflection 一級(jí)反射 | first order spectrum 第一級(jí)光譜 | first principal point 第一主點(diǎn)