同根常考词汇：需掌握
◆ex-wife[‘ekswaif]n.前妻
举例：He has to pay maintenance to his ex-wife.
他必须负担前妻的生活费用。
◆ex-president[’eks‘prezidnt]n.前任总统
举例：The ex-president is a known farsighted politician.
前任首相是一位公认的有远见的政治家。
