Exploring the Difference: by+a+car vs. by+car

by a car释义：

被车

例句：

He died after being knocked down by a car.

他被一辆汽车撞倒后死了。

Tragedy struck the family when their son was hit by a car and killed.

这个家庭惨遭不幸，他们的儿子被汽车撞死了。

by car释义：

乘汽车

例句：

It's too far to walk—I'll take you by car.

步行路太远，我开车送你去。