They are finely engineered boats.是什么意思？

They are finely engineered boats.

这些船只设计制造精良。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

finely

adv. 美好地，精细地，细微地；

例句
The arithmetic is finely balanced: the socialists and their allies do not have an overall majority.
该估算是经过仔细权衡的：社会主义者和他们的同盟并不占绝大多数。

engineered

[医]设计的，工程监督的；

例句
Many of Kuwait's spacious freeways were engineered by W S Atkins.
科威特有很多宽阔的高速公路是阿特金斯集团设计建造的。

boats

n. 小船，小艇( boat的名词复数 )；

例句
Sailing boats lay at anchor in the narrow waterway.
帆船停泊在狭窄的水道上。