train on的用法和樣例：
例句
- They ranged their guns on the enemy blockhouse.
他們把大炮瞄準敵人的碉堡。 - Cupid draws his arrow on both footman and pharaoh.
愛神丘比特的箭已瞄準了沐浴在愛河中的人們。 - She trained her camera on the caged panda.
她把照相機對準籠子里的熊貓。 - The cannon is zeroed in on a certain target.
大炮對準一個確定的目標。
辭彙搭配
- get on the gravy train 干不費勁的差事...
