17　by和with

1　by 指做某事的方式。

He earned money by writing. 他靠写作挣钱。

The streets are lighted by electricity. 街道用电照明。

2　with 指做某事所用工具。

The policeman opened the door with a special key. 警察用专用钥匙打开了门。

My father is digging the garden with a pick. 我父亲用镐在园子里挖土。