The author's intention is to keep everyone guessing until the bitter end.

这位作者的意图是在最终结尾前让所有人都猜不透。

《柯林斯英汉双解大词典》

They were prepared to fight to the bitter end for their rights.

他们甘愿为自己的权利斗争到底。

《牛津词典》

It is always easy to be logical. It is almost impossible to be logical to the bitter end.

合乎逻辑往往很简单，然，坚守逻辑到痛苦的终点却几乎不可能。

youdao

Al Arabiya TV reports that the government is welcoming the Houthi rebel leader's offer to negotiate to put an end to the bitter fighting which has devastated parts of Saada province.

VOA: standard.2009.10.11

But the fact remains that there are still young people in schools and there are still teachers who will hang on to the bitter end to provide their charges with the best quality education they can.

BBC: The supply teacher

The European People's Party, the conservative parliamentary grouping that backed Mr Buttiglione to the bitter end, will try to ensure that other commissioners are also shifted.

ECONOMIST: The European Commission

At the time they were recording the album, all five band mates were going through painful breakups: The McVies were divorcing, Buckingham and Nicks' long-term relationship was coming to a bitter end and Fleetwood's wife was about to leave him for his best friend.

CNN: Fleetwood Mac's 'Rumours' at 35: Still the 'perfect album'