You have to grit your teeth and work hard.

你一定要咬紧牙关，努力工作。

You'll just have to grit your teeth and take them.

你只能咬紧牙关鼓足勇气接受它。

You grit your teeth and put on another trade. Another loss.

你咬牙切齿地再交易一次，又是亏损。

Grit your teeth, fix your gaze, and observe death at this moment.

在死亡来临时，要紧牙关，坚定目光，正视死亡。

You just have to grit your teeth and work harder to get good at it.

你只是需要咬紧牙关，更加努力地去学好它。