叶片背面指在计算工况时，叶片承受液流平均压力较低的面。
... low pressure side 低压侧 low pressure side of blade 叶片背面 low pressure slide valve 低压滑阀 ...
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叶片背面有橙色斑点。
果梨形叶片背面浓密灰色的或淡黄灰色被绒毛。
Fruit pyriform; leaf blade abaxially densely gray or yellowish gray tomentose.
植物通过根吸收水分，然后经叶片背面的微小气孔散发至空气中。
Plants take in water through their roots, then release it through small pores on the underside of their leaves.
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