※ 引述《kirel (Fly dream)》之銘言： 囉嗦一下好了，有誤請多指教 首先我習慣簡化題目，以便解釋文法 因此我把原句做以下的簡化 (準備不看的部分先括號起來) 原句: It is essential to reform the system for determining the prices at which the state purchases and sells grain (and to take further steps to regulate the stockpiling of grain). 簡化1: It is essential to reform the system for determining the prices at which the state purchases (and sells) grain. 兩次簡化後的句子: It is essential to reform the system for determining the prices at which the state purchases grain. 上面這句可拆成兩句: (把which看做是代替the prices的關係代名詞) 1. It is essential to reform the system for determining the prices. 2. The state purchases grain at the prices. 由上面拆成的兩個句子可以看出 若原句沒有at這個介係詞，則拆不成兩個句子 也就無法將兩個句子用關係代名詞合併成一個句子 (或是你可以將上面兩個句子反過來合併成一個句子，如下: It is essential to reform the system for determining the prices which the state purchases grain at. 然後將介係詞放到關代前面 (原因為什麼有請高人解釋) 就變成了: It is essential to reform the system for determining the prices at which the state purchases grain. 這個方式去想) 至於你的at which = when 的認知，可能得去將文法書看仔細 並非每次看到at which都能將他想成when eg1: This is the desk at which I sit. = This is the desk where I sit. eg2: The cat at which he is angry is mine. 以上是我的見解 請多指教 : 請問以下句中at which的意思: : it is essential to reform the system for determining the prices at which : the state purchases and sells grain and to take further steps to regulate : the stockpiling of grain. : 我的認知是at which=when : 因此翻譯為: : 為了決定國家買賣穀物時的價格，改革體系十分重要…… : 又at which的at是否可省略呢? : 謝謝大家 -- --

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