1. 鱼网：tramline 电车轨道 | trammel net 鱼网 | trammel 束缚

2. 三重刺网：tramette silk 制袜粗蚕丝 | trammel net 三重刺网 | trammel 椭圆量规

noun

1. a fishing net with three layers
the outer two are coarse mesh and the loose inner layer is fine mesh

Synonym: trammel