The answer is because Sphinx-4 is good, but not perfect.

答案是因为 Sphinx-4 十分优秀，但并不完美。

youdao

The answer is simple — synchronization is good, but not perfect.

答案很简单-同步是不错，但它并不完美。

youdao

The researchers describe their results so far as “encouraging, but not perfect”.

研究者们这样描述他们的结果，“只是不错，但是并不完美”。

youdao

"It is not perfect, but then there is no country that has a perfect system."

VOA: standard.2009.09.24

Not with this girl, this girl is perfect. But in the past, I've had lots of problems with roommates.

和这个女孩没吵过，她太完美了。但在过去，我和室友之间存在很多问题。

布鲁克林的房价 - SpeakingMax英语口语达人

They are not forms, but they are perfect in that way. Was that the thought?

它们不是形式，但是却很像,你是这样想的么？

耶鲁公开课 - 死亡课程节选

The randomization worked well and adherence to the diet was reasonable but not perfect (just as you might expect in practice).

FORBES: ?Ol��! How the New Spanish Study Should Change Your Diet

He rejects the notion that hunches are second best, trading off accuracy for effort to achieve decisions that are "good enough" but not perfect.

WSJ: Matt Ridley on Gut Feelings and the Writings of Gerd Gigerenzer | Mind & Matter

In the Comfortable But Not Perfect Two-Bedroom Apartment of Good.

WSJ: Five Thoughts on the Knicks