这里的 shape 是动词，意思是“使成为…形状(或样子)”。

Flutes are shaped like long tubes.

句意为：笛子的形状像长管子。

又如：

The plate is shaped like a fish. 那盘子形状像条鱼。

The metal piece is shaped like a new moon. 这个金属片制成新月状。

The crackers were shaped like little goldfish. 饼干的形状就像一条小金

My textbook is shaped like a rectangle. 我的课本形状是长方形的。

The lenses of her sunglasses were shaped like hearts. 她的太阳眼镜镜片是心形的。

The child’s moneybox was shaped like a house. 这个小孩的存钱盒形状像幢房子。