下面短文中有10处语言错误，请在有错误的地方增加、删除或修改某个单词。
增加：在缺词处加一个漏词符号（∧），并在其下面写上该加的词。
删除：把多余的词用斜线（﹨）划掉。
修改：在错的词下划一横线，并在该词下面写上修改后的词。
注意：
1．每处错误及其修改均仅限一词；
2．只允许修改10处，多者（从第11处起）不计分。
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Dear Jacob,
Glad to hear from you. I would love to tell you something about my new invention, that can catch snakes but not harm them.
First I bought an ice-cream maker making of steel. Between the outside and the inside wall of the bowl there is some jelly, which freeze when cooled. I put the bowl into the fridge. Then in the evening I placed a frozen bowl in the snakes’ habitat and some ice cubes on top of the bowl to keep cool. Finally I covered the whole thing with a large bucket. The next morning when I removed the bucket or the bowl, I found the snakes very sleepily. I collected the passive snakes using a net and released it all back into the wild.
What do you think of my invention? Glad to hear from your advice. Thank you.
Best wishes,
Caroline