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1·The blade of the oar had entangled itself with the strap of her bag.

桨叶和她包的带子紧紧缠在了一起。《柯林斯英汉双解大词典》

2·The blade of the oar had entangled itself with something in the water.

船桨的桨叶和水里的什么东西缠住了。

3·Oar-blade set is composed of main oar-blade 4 and subsidiary one 2. which lean and stagger some angle with the level and are laid relatively in direction.

浆叶装置由主浆叶4和副浆叶2构成，主、副浆叶与水平面倾斜，相错一定角度，方向相对布置。