膜翅的背腹壁之间也具有内腔和皮细胞，并充满油脂腺（经分析是棕脂肪细胞腺）及其分泌物。
There are cavities in the hymenoptera which are full of the brown fat glands and their secretion.
在炉管背火侧的一定范围内增加适量的钉头或翅片，可以提高背火侧的受辐射面积。
A certain amount of nail head or fin within an acceptable range of tube's back side can improve the area of access to radiation.
在炉管背火侧的一定范围内增加适量的钉头或翅片，可以提高背火侧的受辐射面积。
A certain amount of nail head or fin within an acceptable range of tube's back side can improve the area of access to radiation.
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