Here is prime condition of success, the great secret: concentrate your energy, thought, and capital exclusively upon the business in which you are engaged.
Having begun in one line, resolve to fight it out that line, to lead in it, adopt every improvement, have the best machinery, and know the most about it.
【正确答案】一旦开始干那一行，就要决心干出个名堂，要出类拔萃，要点点滴滴地改进，要采用最好的方法，要尽力通晓这一行。
【答案解析】 原句是祈使句，现在分词短语having begun...在句中作条件状语，相当于once you have begun...祈使句中有多个并列的动词短语，但并无明确的主语，汉译时为保持原话风格也无需译出主语。fight it out意为“一决雌雄，决出胜负”；machinery原意为“机器，机械”，在此根据上下文理解为“方式，方法”。因为原句是祈使句，汉语里习惯用“要……”表达。全句采用意译法。