Now for simply describes an amount or a duration of time.

“For”描述的是一段时间。

It's tricky because we use the verbs 'take' and 'last' to talk about durations of time.

这很棘手，因为我们用动词 take 和 last 来表示时间的持续。

Therefore, this natural selection ensures that a species gradually improves itself over an extended duration of time.

因此，这种自然选择可确保物种在很长一段时间内逐渐自我完善。

And both of these words explain how long something has been happening for, it's a duration of time.

而所有这些单词解释的是某事发生了多久，是一段时间。

This is the duration of time.

这是持续时间。

Children, teenagers and adults who listen to headphones for long durations of time are at a significant risk of hearing loss.

长时间听耳机的儿童、青少年和成年人都有很大的听力损伤风险。

Okay? So we're talking about the duration of time, how long something happens for.

好的？ 所以我们谈论的是持续时间， 某件事发生了多长时间。

The duration of time was two weeks. So I was in New York for two weeks.

持续时间为两周。所以我在纽约呆了两个星期。

So both of these sentences use the adverb, for, to give us more information about how long the action has been happening for, the duration of time.

这两个句子都用了副词，for，向我提供关于这个动作发生了多久的信息，持续的时间。

The additionality of a project, the certainty with which you know that carbon will be avoided or removed, the duration of time over which your investment will remain valid.

项目是否有额外的减排效果，投资人是否对碳抵消或碳移除抱有信心，投资的有效期。