Lawrence Seaway system, it is navigable for oceangoing vessels, although winter ice in the shallower sections impedes free passage.Samuel de Champlain first sighted the lake in 1615.是什么意思_Lawrence Seaway system, it is navigable for oceangoing vessels, although winter ice in the shallower sections impedes free passage.Samuel de Champlain first sighted the lake in 1615.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句