persevere

v. 坚持,孜孜不倦,不屈不挠

If you persevere with work, you'll succeed in the end.

你如果把工作坚持下去，最终会取得成功的。

When things get difficult, you just have to grit your teeth and persevere.

遇到困难只需咬紧牙关坚持下去.