a riverboat pilot
河船引水员、领航员
例句：
He spent two years learning the river and becoming a riverboat pilot, but hiscareer onthe river was ended bythe Civil War.
他花了两年的时间学习有关河流的知识，成为河船引水员，但是内战终止了他的河上生涯。
Over the nexttwo decades he was a printer, a riverboat pilot, a soldier,a goldminer,a businessman anda newspaper reporter.
在这之后的40年里，他当过印刷工、领航员、士兵、矿工、商人、还当过新闻记者。
