Feathers initially developed from insect scales.是什么意思？

Feathers initially developed from insect scales.

羽毛最初由昆虫的翅瓣演化而来。

feathers

n. 羽毛( feather的名词复数 )；

例句
The tail feathers are dark blue at their bases, shading to pale blue at their tips.
尾羽的根部呈深蓝色，到了尾尖就渐变成淡蓝色。

initially

adv. 开始，最初；

例句
He was initially articled to a solicitor.
他最初订约给一位律师当学徒。

developed

adj. 先进的，发达的（国家或地区）；

例句
He had developed a slight American accent.
他说话带上了一点轻微的美国口音。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

insect

n. 虫，昆虫，卑鄙的人，微贱的人，小人；adj. 昆虫的，卑劣的；

例句
He finds the comparison of insect wings with a sailing boat useful up to a point...
他发现把昆虫的翅膀比作一艘帆船在某种程度上是有用的。

scales

n. 刻度( scale的名词复数 )，水垢，比例（尺），鱼鳞；

例句
Today's slightly shorter race could well help to tip the scales in his favour...
今天距离稍短的赛跑可能会对他占据优势大有助益。