railway line 鐵路線;
telephone line電話線;
product/assembly line 生產(chǎn)/裝配線;
county/state line 縣/州界;
transmission line 傳輸線;
main line 干線;
power line 電源線;
bottom line 概要/關(guān)鍵;
online 在線的;
line of business行業(yè)，營(yíng)業(yè)范圍;
straight line直線;
dotted line虛線