用法:
1 go back over or repeat (a journey, route, etc) exactly 折返或重行（原路程、 路线等）:
retrace one's steps, ie return the way one came 顺原路折回.

用法:
2 recall a series of (past actions, etc) 回忆, 回顾, 追溯（经过情形等）:
Police retraced the movements of the murder victim. 警方追溯了那被谋杀者当时的情形.

• although(though)
• although(while)
• altogether(all together)
• always(often)
• amiable(amicable)
• amid （ st ）(among)
• among(between)
• among(in)
• amount(number)
• amount(quantity)
• ample(enough)
• ample(every)
• an amount of(a number of)
• an amount of(a quantity of)
• and all(and all that)
• and not(not… but)
• and then(but then)
• and(and also)
• and(as much as)
• and(but)
• and(no less than)
• and(or)
• and(plus)
• and(while)
• another(different)