adj.轴外的；离开轴心的；远（背）轴的

The abaxial surface of the leaf is covered in fine hairs.
叶的背面色泽光滑，布满了细毛。
The abaxial petal of the flower is larger than the others.
这朵花的背面花瓣比其他的要大。
The veins on the abaxial side of the leaf run parallel to each other.
叶片的背面上的脉络是平行的。
The abaxial surface of the leaf often changes color in autumn.
叶子的背面在秋天常会变色。
Pollen grains are released from the anthers on the abaxial side of the stamen.
花粉粒从雄蕊的背面花药中释放出来。
The abaxial epidermis of the leaf has stomata for gas exchange.
叶的背表皮有气孔用于气体交换。
The abaxial surface of the fern frond is a rich green.
蕨类植物叶片的背面是深绿色的。
The abaxial surface of this species' leaf is marked with distinctive spots.
这个物种的叶子背面有独特的斑点。
In some species, the abaxial surface of young leaves is covered with a waxy coating.
在某些物种中，幼叶的背面覆盖有一层蜡质。
The underside, or abaxial surface, of the butterfly's wings is camouflaged.
蝴蝶翅膀的下面，即背面，具有伪装色。