Because 'at' is used when you indicate a specific time.

因为“at”是在表示特定时间时使用的。

Many animals 'breed' only at a specific time of a year.

许多动物只在一年的特定时间“繁殖”。

You had to sweep the floor at specific times. You had to take out the garbage at specific times.

你必须在特定的时间扫地。你必须在特定的时间倒垃圾。

We can also use the to talk about specific times of day.

我们还可以用“the”来谈论一天中的特定时间。

It's often at a very specific time, and the routine is important.

“而且通常都是在固定的时间吃，养成习惯很重要。”

I don't think there's a specific time. You just go for it.

我认为没有具体的时间。直接做就好了。

It can also express that something happened before a specific time in the past.

它也可以表示在过去的某个特定时间之前发生的事情。

So there's specific time and there's kind of general time.

所以这里有特殊的时间，而这里是一个大概的时间。

The parents not only decide how much, they can block out specific times of day.

父母们不仅能决定小孩看电视的时长，还能划定出一天中的特定时间。

And you shouldn't use it with specific times, right?

而且你不能用它跟具体时间连用，对吧？

Again, before a specific time, we use the word " at" , the preposition " at" .

在一个特定时间之前，我们用单词 " at" ，介词 " at" 。

So we use 'in' to indicate a specific time within a larger time frame.

所以我们用“in”来表示更大时间范围内的特定时间。

It can be used all the time or set to come on at a specific time.

" 黑暗模式" 可一直打开，或在特定时间启动。

Again, no time reference needed because we both know we're talking about that specific time.

不需要时间参照，因为我们都知道我们说的是那个特定的时间。

But there are no kind of specific time slots for when you're going to do it.

但是并没有特定的时间段来告诉你什么时候去做。

So 'in' a specific time within a larger time frame.

所以“in”是在更大的时间范围内的特定时间内。

Shows were broadcast at specific times, and if you weren't there on time you missed it.

所有节目都在固定时间播出。如果你没有准时收看或收听, 你就与它失之交臂了。

Use " at" for very specific times.

" at" 用于非常特殊的时间。

When the main trigger is pollinating plants, allergic rhinitis will flare up at specific times of the year.

当授粉植物是诱发的主要因素时，过敏性鼻炎将在每年的特定时期突然急性发作。

You have a specific place you're supposed to be and the class is happening at a specific time.

你应该在一个特定的地点和特定的时间上某堂课。