navigation-coal

常见例句

Navigation is difficult on this river because of the hidden rocks.
因爲河上有暗礁，所以在這條河上航行很睏難。
We need to replenish our stocks of coal.
我們需要再次補充煤的儲備。
The compass is an instrument of navigation.
羅磐是航行儀器。
She piled on more coal before the fire go out.
在火熄滅之前她又加上些煤。
I add the coal on the flame continuously.
我不斷朝火裡添加煤炭。
They are ventilating the sap of a coal mine.
他們正在使煤鑛坑道通風。