You might think my reflexive answer to this would be, how about never?

你可能以为我对这个问题的应会是，永远不会吧？

But we don't use a reflexive pronoun with prepositions of place.

但是我们不会把代词和表示地点的介词连用。

We use a reflexive pronoun in the first part of the sentence.

我们在句子的第一部分使用了代词。

That means the star will make a small circle — what's called reflexive motion.

这意味着恒星会转一个小圆圈——这被称为自运。

It's reflexive. So we don't need anything there.

它是自的。因此我们不需要任何东西。

It gets to the point where it's reflexive, automatic.

它达到了射性的、自的程度。

A reflexive pronoun describes the subject of a sentence.

代词描述句子的主语。

It isn't a reflexive verb in English.

它在英语中不是词。

Reflexive pronouns refer back to the subject of a sentence or clause.

代词指代一个句子或从句中的主语。

We've learned when to use reflexive pronouns and when not to.

我们学会了什么时候用代词，什么时候不用。

And interestingly this expression is usually reflexive so the subject and the object are the same.

有趣的是，这种表达通常是形式的，所以主语和宾语是相同的。

Sometimes we use a reflexive pronoun without " by" .

有时我们用代词，不带by。

Startle syndrome, also called hyperekplexia, is a rare disorder in people's reflexive reactions to surprise or agitation.

惊吓综合征，也被称为过度兴奋症，是一种罕见的疾病，是人们对惊讶或激的射性应。

Although it has other meanings, when used with a reflexive pronoun, it means alone or without help.

它还有其他意思，但当与代词连用时，它的意思是独自或没有帮助。

Okay, so we use a reflexive pronoun when it refers to the subject of a sentence or clause.

好的，所以我们用代词指代一个句子或从句的主语。

But in the second part of the sentence, we don't use a reflexive pronoun in the prepositional phrase.

但是在句子的第二部分，我们没有在介词词组中使用代词。

She'll need to use the reflexive pronoun " myself" .

她需要使用代词“myself”。

This usage may have the same meaning as " by" reflexive pronoun.

这种用法可能与by加代词有相同的意思。

I have a feeling we are going to see a lot of reflexive pronouns.

我感觉我们会看到很多代词。

Another way is to measure the Doppler shift in a star's light due to reflexive motion as the planet orbits.

另一种方法是测量恒星光线的多普勒频移，这种频移是由行星绕轨道运行时的自运引起的。