輪船的航線是標(biāo)在航海圖上的.The course of a ship is marked on a chart.領(lǐng)航員在航海圖上標(biāo)出船的航線.The navigator charted the course of the ship.船長(zhǎng)在航海圖上標(biāo)出了這個(gè)區(qū)域,在這一區(qū)域里航行是相當(dāng)安全的.The captain charted this area out and it's quite safe to sail in it....