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》

With his sad, crinkled eyes in a craggy face whose expression runs from sorrowful to bitter, Gene embodies the rugged can-do American spirit near the end of its tether but still undefeated.

他目光忧郁哀伤，幽怨和痛苦都写在了他苍老的脸庞，基恩是种象征，象征不屈不挠的美国“我能”精神，只是渐感力不从心，但是仍然没有放弃。

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

As for their SLA comrades who remained loyal to Israel to the bitter end, they fled to the Israeli border by the thousands with their families in the hours that followed Israel's middle-of-the-night retreat.

CENTERFORSECURITYPOLICY: Lebanon's legacy in Afghanistan