精密的英文：
accurate
exact
precise
precision

参考例句：

Accurate die casting
精密压铸

Nice scales
精密的天平

vernier depth gauge
【机】精密测深尺

We can manufacture high-precision machine tools.
我们能造精密机床。

The eye is a complex and highly developed photosensitive organ
眼是复杂而且高度精密的感光器官。

Now they can make all kinds of precision machine tools.
现在他们能够制造各种精密机床。

His company is the leader in precision metal casting.
他的公司在精密金属铸造方面是领先者。

The broad [narrow] phonetic notation
【语音】简略[精密]标音法

Do you know how to tool accurately machine parts?
你知道如何精密加工机器零件吗？

Judging is not an exact science. We may never know who's right.
判断不是一门精密科学.，我们可能永远也不清楚谁是对的。

exact是什么意思：
adj. 精确的；严谨的；精密的
v. 要求；强迫

The authority has no exacting responsibility.
（授予的）职权没有明确责任。

What's the exact count?
确切的总数是多少？

The task proved to be exacting.
这项任务结果是很艰巨的。

precise是什么意思：
adj. 准确的，确切的；明确的；恰好的；严格的；细致的；刻板的

That answers precisely to our needs.
这正好适合我们的需要。

Your report lacks precision.
你的报告不够准确。

It is written in a detached, precise style.
行文冷静客观，一针见血。