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first offender：初犯者

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

first or last：[古、罕]早晚, 迟早

first of all 第一, 首先 | first off 马上, 立刻 | first or last [古、罕]早晚, 迟早

first or last：迟早,早晚

eg:He was a real gentleman,first and last.从各方面来看,他都是个正人君子 | first or last 迟早,早晚 | from first to last 自始至终,一贯

It doesn't matter whether it's done first or last, as long as it's done：只要做这件事就行,迟点早点没关系

first or last迟一点或者早一点: | It doesn't matter whether it's done first or last, as long as it's done. 只要做这件事就行,迟点早点没关系. | first thing首先要做的事:

first order spectrum：第一级光谱

first order reflection 一级反射 | first order spectrum 第一级光谱 | first principal point 第一主点

First Order Theory：初等理论;一阶理论

一阶极点;单级点 first order pole | 初等理论;一阶理论 first order theory | 首次通过 first passage

First Order Theory：一级近似理论,高斯光学,第一级近似理论,线性化理论

first-order test 一级检验 | first-order theory 一级近似理论,高斯光学,第一级近似理论,线性化理论 | first-order transition 一级相变

first quadrant：第一象限

first order theory 一阶理论 | first quadrant 第一象限 | first quartile 第一四分位数

first quadrant projection：第一角象限投影

"一次矩","first moment" | "第一角象限投影","first quadrant projection" | "初绞螺丝攻,头攻","first roughing tap"

first quarter：上弦

first point of aries 春分点 | first quarter 上弦 | first resonance 一次共振

BOXEN INTERNATIONAL LIMITED：(博成国际有限公司)

571908 BOWEN PROPERTY AGENCY LIMITED (宝云置业有限公司) | 380193 BOXEN INTERNATIONAL LIMITED (博成国际有限公司) | 159389 BOXYUE LIMITED (博誉有限公司)

air filter：空气过滤器

空气过滤器(air filter)指用于制备无菌空气的纤维介质床或超细滤膜过滤器. 纤维介质主要是棉花,常用的滤膜是玻璃纤维滤膜和孔径为0.2μm的聚四氟乙烯滤膜. 过滤器使用前本身应用蒸气或其他方法灭菌. 通过过滤器的空气事先进行除尘、除水滴,