近义词解析：原因表达
📚 核心词汇
1. reason (n.) 原因，理由
The main reason for his success is hard work.
他成功的主要原因是努力工作。
他成功的主要原因是努力工作。
2. cause (n.) 起因，根源
The police are investigating the cause of the accident.
警方正在调查事故的起因。
警方正在调查事故的起因。
3. factor (n.) 因素，要素
Climate is an important factor in agriculture.
气候是农业的重要因素。
气候是农业的重要因素。
4. motive (n.) 动机，目的
The detective is trying to find the murderer's motive.
侦探正在寻找凶手的动机。
侦探正在寻找凶手的动机。
💡 顾老师提示："reason"强调逻辑性原因，"cause"侧重直接因果关系，"factor"指影响因素，"motive"专指人的行为动机。
🔊 发音对比
reason：/ˈriːzən/ [ˈriːzən]
cause：/kɔːz/ [kɔːz]
factor：/ˈfæktə(r)/ [ˈfæktər]
motive：/ˈməʊtɪv/ [ˈmoʊtɪv]
发音要点：
- "reason"注意长音/iː/和词尾/zən/的连读
- "cause"的/ɔː/要饱满，类似"考"的发音
- "factor"重音在第一音节，/æ/要短促有力
- "motive"注意美式发音的/oʊ/双元音
💡 顾老师纠音：常见错误：
- 将"reason"读成"瑞森"（正确：[ˈriːzən]）
- "cause"的/ɔː/发音不充分
- "factor"重音错误地放在第二个音节
🎯 用法辨析
1. reason vs. cause
The reason I'm late is traffic. (主观解释)
The cause of the delay was a car accident. (客观事实)
The cause of the delay was a car accident. (客观事实)
2. factor vs. element
Economic factors affect prices. (可量化因素)
Luck is an element in success. (抽象成分)
Luck is an element in success. (抽象成分)
3. motive vs. intention
The police suspect financial motive. (深层动机)
Her intention was to help. (表面目的)
Her intention was to help. (表面目的)
搭配注意：
- the reason for (doing) sth
- the cause of sth
- a factor in sth
- motive for (doing) sth
📝 随堂练习
1. 选词填空：
a) The main (reason/factor) he quit was stress.
b) Smoking is a leading (cause/motive) of lung cancer.
b) Smoking is a leading (cause/motive) of lung cancer.
2. 近义词替换：
Original: What was your reason for coming?
Alternative: What was your (purpose/motive) for coming?
Alternative: What was your (purpose/motive) for coming?
3. 听辨练习：区分发音
a) [ˈriːzən] vs [kɔːz]
b) [ˈfæktər] vs [ˈmoʊtɪv]