表示动作的直接对象
1. indicates direct object of action
particle
2. indicates subject of causative expression
particle
表示经过的场所
3. indicates an area traversed
particle
4. indicates time (period) over which action takes place
particle
表示离开或分开的点
5. indicates point of departure or separation of action
particle
6. indicates object of desire, like, hate, etc.
particle