persistent坚持的
After persistent efforts they finally succeeded in the experiment.
经过不懈的努力他们的实验终于成功了。
He is such a persistent person that it is hard to change his mind.
他是一个非常固执的人，因此很难改变他的主意。
avoid避开
I crossed the street to avoid meeting him,but he saw me and came running towards me.
我穿过马路以便避开他，但他看见我并朝我跑过来。
He tried to avoid making the same mistake.
他试图避免犯同样的错误。
Drivers can avoid danger by being careful and alert all the time.
只要一直警惕，小心，司机可以避免危险。
insist坚持做
No matter how busy you are,he always insists on coming with you.
不管你多忙，他总是坚持要跟你去。
They insisted that I deliver a speech at the meeting.
他们坚持要我在会上发言。
He insisted on her participation in the debute.
他坚持要她参加辩论。
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