external

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They've evolved an external skeleton,
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They've evolved an external skeleton, 它们进化出了外骨骼

skeleton external evolved an they've
They invade the upper branches, where they climb out of their external skeletons and assume their adult winged form.
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They invade the upper branches, where they climb out of their external skeletons and assume their adult winged form. 占据上端的树枝后 若虫开始进行转变到蝉的蜕皮动作

skeletons invade branches assume winged external adult climb upper form where their out they of the and
External gills help it to breathe in water that is particularly low in oxygen.
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External gills help it to breathe in water that is particularly low in oxygen. 外生的鳃帮助它们 在极度缺氧的水中呼吸

breathe external gills low help particularly oxygen it water is in that to
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