中英释义：
双语例句
虽然这两人担任上述职务都有数年，但花旗发言人解释说，公司会对委员会主席进行定期轮换，这次会在今年夏季开始。
While both men have held the posts for several years, the Citigroup spokeswoman said the company periodically rotates its committee chairmen and expects to start doing so this summer.
重点词汇
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定期
regular; scheduled; periodic; fixed-term; rolling; schedule; fix a date; regularize; regularise; regular basis; regularly; periodically
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轮换
rotate; alternate; take turns; switch; interchange