求助.这是一道英语题,我看不懂,具体见下
I am a word.I have four letters.
My first letter is in horse but not in worse.
My second letter is in ice but not in cake.
My third letter isn't hood but in good.
My last letter is in have but not in vase.
What am I?

翻译结果如下
我是词我有四封信.
我的第一个字母是在马而不是更糟.
我的第二封信是在冰上而不是在蛋糕.
我的第三封信不是罩在好.我的最后一封信,
是有而不是花瓶.我是什么?