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1、persist
（不喜欢的事物）继续存在
Contact your doctor if the cough persists.
如果还是咳嗽就去看医生。
These problems persisted for much of the decade.
这些问题在那10年的大部分时间里一直存在。
顽强坚持；执著
Why does Britain persist in running down its defence forces?
为什么英国要坚持消减其军事防御力量？
He urged the United States to persist with its efforts to bring about peace.
他敦促美国继续进行和平斡旋。
2、weed out
清除;剔除;淘汰
He is keen to weed out the many applicants he believes may be frauds.
他急于剔除那些他认为是冒牌货的申请人。
A small group of neo-Nazis have infiltrated the ranks. We must weed them out as soon as possible.
队伍中混入了一小撮新纳粹分子，我们必须尽快将其清除。
