n.英寻（=6英尺)
vi.测量深度
vt.彻底了解；测深
The ship sank in four fathoms. 这条船沉下四英寻。
I cannot fathom his meaning. 我不能彻底了解他的意思。
He dipped the stick into the water to fathom its depth. 他把棍条浸入水中，试探水的深度。
