So, they are not interchangeable all the time.

所以，它们不是一直都可以互换的。

When are the two words interchangeable? Thanks.

这两个词什么时候可以互换？多谢。

But left and right seem to be more interchangeable.

但是左和右更可能相互转换。

And also, all the accessories are collectible and interchangeable.

而且，所有的配件都是可以收藏和互换的。

The phrases " take note" and " make note" are sometimes interchangeable.

" take note" 和" make note" 这两个词组有时候是可以互换的。

When used as a noun, " limelight" and " spotlight" are interchangeable.

当被用作名词时，“limelight”和“spotlight”是可以相互替换的。

But club soda, seltzer, and sparkling water are not interchangeable.

但是club soda（苏打水）、seltzer（赛尔托斯）和 sparkling water（天然气泡水）并不是同样的饮品。

In the United States, the words " couch" and " sofa" are generally interchangeable.

在美国，" couch" 和" sofa" 这两个单词通常可以互换。

Easy answer --- nothing! The words are interchangeable and an issue of personal choice.

答案很简单——没区别！这俩词是可以互换的，这是个人选择的问题。

But sometimes it is not. So, they are not interchangeable all the time.

但有时候不是。因此，它们不总是可以互换的。