temperature后面为什么有 at which

For some substances， such as steel，the temperature at which it becomes a liquid is much higher.

请问temperature 后面为什么有at？这个which是指代steel吗？

For some substances, such as steel, the temperature at which it becomes a liquid is much higher.

【翻译】对于一些物质，例如钢，它变成液体的温度（比固态）要高得多。

1. 本句的主干是：the temperature is much higher. 温度要高得多。

2. For some substances, such as steel：for表示“对...而言”，such as 表示给substances（物质）“举例”。at 跟这一部分毫无关系，跟steel也自然无关了。这里，at 跟the temperature 的搭配有关。

3. at which it becomes a liquid：是定语从句，修饰the temperature。其中，关系代词which 指代temperature，介词at 跟“温度”搭配。

4. 英语中，at跟表示“温度；速度；比率”的名词搭配。又如：

Water freezes at the temperature of 0 degrees Celsius. 水在摄氏零度结冰。

I drove back down the motorway at normal speed.

我以正常速度沿高速公路往回开。

You will be paid at the rate of $34 a day.

你将获得每日34元的工资。

刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编

擅长：语法理论,语言学,文化背景 | 采纳率 86% | 回答于 1秒前

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黎反修 - 英语翻译（已退休） 1秒前

擅长：数词用法,存在句,英语考试

1. 温度只有高低之分，没有大小之别。所以，问题中的 bigger 应该改为：higher

2. “在”某种温度下，介词应该用 at ，例如：This food must be kept at a low temperature. 这种食物必须保存在低温下。（摘自外研社、建宏《英汉多功能词典》temperature）

3. “in temperature”表示“在温度方面”，这里的介词要用 in 不能用 at 。例如：Be careful of a sudden change in temperature .要注意气温的突然变化。（摘自外研社、建宏《英汉多功能词典》temperature）

曹荣禄 1秒前

擅长：动词用法,句法问题

For some substances， such as steel，the temperature （at which it becomes a liquid） is much higher.

该句的主干为 the temperature is much higher

at which it becomes a liquid为定语从句，修饰temperature，which指代先行词temperature, it指代steel。与temperature 搭配的介词为at, 所以用at which. 例如：

Water boils at 100 ℃.

该句译文：某些物质（比如钢）从固态变为液态的温度要高得多。

陈才 - 英语教师 1秒前

擅长：中考英语,词法问题

For some substances， such as steel，the temperature at which it becomes a liquid is much higher.

at which it becomes a liquid is much higher为定语从句修饰前面的先行词termperature.关系代词which代替先行词并在定语从句作介词at宾语