He is expected to be the key witness at the trial.

预计他将成为审判时的关键证人。

《柯林斯英汉双解大词典》

According to the entrepreneur behind the company, Matthew Krisiloff, this will be the key to pleasing the uninitiated palate.

根据该公司的创始人马修·克里斯洛夫的说法，这将是取悦外行人的关键。

youdao

Fast Internet speed will be the key to developing this technology.

高速网络将是发展这一技术的关键。

youdao

Soon he realized the game might be the key to both their recovery and acceptance in the community.

VOA: standard.2010.04.01

Even though there are souls, they may not be the key to personal identity, maybe sameness of the body is the key to personal identity.

即使灵魂存在，它们也不是人格同一性的,关键，也许同样的肉体,才是人格同一性的关键。

耶鲁公开课 - 死亡课程节选

If you find this argument convincing, what it's an argument for is the claim that even if souls do exist, they may not be the key to personal identity.

如果你信服这个观点，我们要证明的是,就算灵魂真的存在，也不是人格同一性的关键。

耶鲁公开课 - 死亡课程节选

France's President Hollande is turning out to be the key player in exerting pressure on Germany.

BBC: Europe: Condition acute for eurozone

So finding ways to develop specialty steels and so forth, that's going to be the key.

WHITEHOUSE: "White House to Main Street" Town Hall: Elyria, OH

Indeed, January's presidential election in Ukraine may be the key event in Russia's new political season.

ECONOMIST: Russia's political leaders