跟E比B改了还是觉得不对,which和that的逻辑意思上还是有不同的 Mahattan里说 when the relative clasuse add non-essential information rather than identifying the noun it follows,"which" is used and is preceded by a comma when the relative clause identifies the noun it follows with essential information rather than adding incremental information,"that" is used without a comma. 我觉得that从句解释说明satellites, 不是non-essential info, 如果换了句子中心有变化