The rain spoiled our picnic.

这场雨弄得我们的野餐一团糟。

spoil有溺爱的意思(看下例)，也有搞糟，弄糟的意思。

He gives whatever his son asks for, that can only spoil his child.

他孩子要什么他就给什么，这只会宠坏他的孩子。

Don't tell Tom that we are preparing a birthday party for him, it will spoil the surprise.

不要告诉汤拇我们正为他整备生日派对，这会失去惊喜的。