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。