不能去掉 句子的意思实际上是Humans on Mars have to wear special boots to make themselves heavier to prevent this.一句话不能有两个动词
意思是,"为了组织这个,火星上的人们不得不穿上特殊的靴子使得他们变得更重."
祈使句前可以用to吗?比如说To prevent this,humans on Mars have to wear sp
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