one
一个（人、物件、地方等）
【例】We hope that this initial business will be one of many to come to our mutual advantage.
我们希望这首次交易将成为许多对双方有利的交易的开端。
only
仅仅，只有
①用于契约、单据中表示数量、金额等之后，防止人们增改数字，作用相当于汉字“整”。
【例】Quantity: 10 000 (Ten Thousand) dozen only.
数量：10 000（壹万）打整。
②用于数字之前，表示“仅有”。
【例】When checking with the shipping company, we were told that only 900 cases had been loaded on board the carrying vessel.
我们向船公司查核，据称仅有900箱装上了运载船。
③only引出的状语提至句首时，句中主谓语就应颠倒。
【例】Only by air freight, can the ordered medicines be transported to the destination within a week.
只有空运，所订的药品才能一星期内运抵目的地。
在职的
【例】We are going to have an on-the-job training for those workers who are doing the ordinary assembly line job.
我们将要为那些装配线上做普通工作的工人进行在职培训。