New Words：

saw [sɔ:] n. 锯
jigsaw ['dʒigsɔ:] n. 拼图；拼板玩具；线锯；竖锯；钢丝锯
blade [bleid] n.刀片；刀刃；桨叶；刀身

Sample Sentences：

A jigsaw is a type of saw with a thin blade.
I don't have the patience to do jigsaw puzzles.
The blades of the electric fan are covered with dust.

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