" Accidental" means happening by chance or because of a mistake.

“意外”是指偶然发生或因错误而发生。

What's happening right, now by the way? The outcome of the roll call was never in doubt at any point.

那现在发生了什么事？记名投票结果没有任何悬念。

I didn't hear any of this while this was happening, by the way.

顺便说一句，在这发生的时候我什么都没听到。

It should be pretty easy to tell if that’s happening just by looking.

仅通过观察就应该很容易判断是否发生了这种情况。

Those two things happening at the same time by accident could be called a coincidence.

这两件事偶然同时发生，可以说是巧合。

Computer simulations suggested that the likelihood of such a rapid change happening by chance, even in a diminished population, was tiny.

计算机模拟表明，即使在人口减少的情况下，如此迅速的变化偶然发生的可能性很小。

You could prevent things like Pearl Harbor from ever happening by informing the Americans that the Japanese are going to attack.

你可以通过通知美国人，日本人要进攻，阻止珍珠港事件发生 。

It's just another bad thing that was happening by this administration but it didn't directly affect me.

这只是本届政府发生的另一件坏事，但它并没有直接影响到我。

I believe that we can stop these types of incidents, these Fergusons from happening, by looking within and being willing to change ourselves.

我相信我们可以阻止这样的悲剧-让弗格森这样的事情不再发生，只要我们内省，愿意改变我们自己。

I was so greatly surprised that at first I did not see what was happening by the stream, but when I did look, I saw a sad sight.

我吃惊地看着这一幕，没顾得上看河边的情形。可是当我望过去的时候，看到的则是一幅悲惨的景象。

So if something happens at one pulsar, you wouldn't expect it to be happening at the other pulsar just by happenstance unless there was something passing through the entire galaxy.

所以如果一颗脉冲星发生了情况，我们不会认为这也偶然发生在另一颗脉冲星上——除非整个星系发生了情况。

ApeVue, a data provider, offers a hint of what is happening by tracking share prices in the secondary markets, where shares of private firms can be bought and sold.

数据提供商 ApeVue 通过跟踪二级市场的股价来提供正在发生的事情的线索，二级市场可以买卖私营公司的股票。

But it also means that those jumps between species, which are so important to understand, but so rare for most viruses, for rabies, they're actually happening by the thousands.

但这也意味着那些物种之间的跳跃， 这对理解来说非常重要，但对于大多数病毒来说非常罕见， 对于狂犬病来说， 它们实际上正在成千上万地发生。

UNIDENTIFIED MALE: We are very worried about risk of a conflict happening by accident with an escalation that is unintended really on either side but hence it's some kind of conflict.

我们非常担心冲突偶然升级的风险，这种升级实际上是任何一方无意的，但因此它是某种冲突。

The goal here is to prevent this from happening in the first place by making sure that the placenta comes out completely intact, and removing any tissue that does get retained as soon as possible.

治疗目标首要的是通过确保胎盘完全排出而预防其发生，并且在发现胎盘滞留后，尽早将残留组织从子宫壁上剥离并移出体外。