crest
[名词]
冠
Ex:
When
alarmed
or
excited
,
the
cardinal
can
raise
the
crest
on
its
head
,
making
it
appear
larger
to
predators
.
当受到惊吓或兴奋时，红雀可以竖起头上的冠羽，使其对捕食者显得更大。
wishbone
[名词]
叉骨
Ex:
They
made
a
wish
and
pulled apart
the
wishbone
,
hoping
for
good luck
.
他们许了个愿，然后拉开许愿骨，希望能带来好运。
primary
[名词]
初级飞羽
Ex:
Injured
birds
may
struggle
to
fly
without
intact
primaries
.
受伤的鸟类如果没有完整的初级飞羽，可能会难以飞行。