顽强地坚持下去！这个问题最困难的部分你已经差不多解决了。
Keep slogging away! You're nearly broken the back of the problem.
youdao
顽强不屈意味着你愿意不屈不挠地坚持下去。
Tough means that you are willing to stand tall and persevere.
一些坚持己见，意志顽强的人，不易与人相处。
Some tough cookies can not get along well with others.
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