I saw a head-on collision between two aeroplanes.是什么意思？

I saw a head-on collision between two aeroplanes.

我看见两架飞机迎面相撞。

saw

n. 锯，谚语，格言；vt.& vi. 往复移动，锯成，用锯，拉锯；v. 看见（ see的过去式），观看，领会，考虑；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

collision

n. 碰撞，冲突，（意见，看法）的抵触，（政党等的）倾轧；

例句
The collision took place in the busiest shipping lanes in the world.
撞船事故发生在全世界最繁忙的航道上。

between

prep. 在…之间，私下，暗中，在…中任择其一，来往于…之间；adv. 当中，中间；

例句
How big is the abyss between what you think you are and what you actually are?
你对自己的认识和真实的你之间差别到底有多大？

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。

aeroplanes

n. 飞机( aeroplane的名词复数 )；

例句
The airlines still have 2,500 new aeroplanes on order.
这家航空公司尚有2,500架新飞机在订购中。