fathom
/ˈfæðəm; `fæðəm/ n
measure (6 feet or 1.8 metres) of the depth of water 英寻（水深量度单位, 合6英尺或1.8米）
The harbour is four fathoms deep. 港深四英寻.
The ship sank in twenty fathoms. 该船下沉二十英寻. =>App 5 见附录5. fathom, v [Tn]
1 measure the depth of (water) 测量（水的）深度.
2 understand or comprehend (sb/sth) fully 充分理解（某人[某事物]）; 领悟
I cannot fathom his remarks. 我不能完全理解他的话.
3 (phr v) fathom sth out find a reason or explanation for sth 找出某事物的原因或理由
Can you fathom it out? 你能想出是怎麽回事吗?