navigation-coal

常见例句

Navigation is difficult on this river because of the hidden rocks.
因为河上有暗礁，所以在这条河上航行很困难。
We need to replenish our stocks of coal.
我们需要再次补充煤的储备。
The compass is an instrument of navigation.
罗盘是航行仪器。
She piled on more coal before the fire go out.
在火熄灭之前她又加上些煤。
I add the coal on the flame continuously.
我不断朝火里添加煤炭。
They are ventilating the sap of a coal mine.
他们正在使煤矿坑道通风。