# 英文论文写作中的三条横线：hypen、en dash、em dash 精选

hypenen dashem dash

1. hypen“-”长度最短，是1）合成词中的连字符；2）负数符号。

low-frequency range

-10 to -5

12-V battery

phase-change-material-integrated thermoelectric panel

Word快捷输入002D，同时按alt + x。

2. en dash“–”长度居中，有时可以替代单词 to，或表示范围，或表示关联。en dash同前后词语、数字间不加空格。

10–15 kg

Navier–Stokes equations

solid–liquid transitions

from 12 to 2 （而非from 12–2

-1 to +6（而非-1–+6

between 1 and 8 April （而非between 1–8 April

Word快捷输入2013，同时按alt + x。

3. em dash 在三者中最长，作用之一是补充说明，与中文破折号类似。em dash与前后单词间亦没有空格。

In the experiment, the temperature—in addition to the pressure—was varied.

Word快捷输入2014，同时按alt + x。

10%

\$15

±97

75°

1. 当单位是词语，只在收尾值后跟单位。

8–10 mm

50–55 kg

2. 当单位是符号，起始值和收尾词后都跟单位。

7 percent–11 percent

3. 而当数字区间位于句首，起始值需用英语拼写，收尾值则可写数字，非符号单位多作缩写。

Twenty-three to 25 g

Seven percent to 11 percent

4. 当句中符号或单位不是同数字连用，需作完整拼写。

a few millivolts to several volts

The resistance is of the order of several megaohms.

The difference was a less than a few percentage points.

12 W/(mK)

25 J/(kg.K)

158 Pas

Word快捷输入2027，同时按alt + x。

25 µV（而非25 uV

12 Å（而非12 A

20–30 Ω（而非 20–30 Ohms

• 勿用上标的字母o代替摄氏度符号，尽管有一些字体下两者极为相似。

• 勿用字母x或星号代替乘号“×”。

1. 加成化合物公式中，用“·”分割成分，两端无空格。水合分子同样适用。

Good-quality boron nitride nanotubes were prepared from BH3·NH3 by vapor-phase pyrolysis.

Good-quality boron nitride nanotubes were prepared from BH3NH3 by vapor-phase pyrolysis.

2. 例举溶剂或者物质时不用冒号，而用en dash，冒号的用场派在解释比例上。

For these studies, thin-layer chromatography was performed using acetone–alcohol–water (1:1:2) as the solvent.

For these studies, thin-layer chromatography was performed using acetone:alcohol:water (1:1:2) as the solvent.

3. 合金的组成元素间用en dash区隔，同金属间化合物区分开来。

Molecular dynamics simulation has been performed for investigating the glass transition of Pd–Ni alloy nanoparticles in the solidification process.

Molecular dynamics simulation has been performed for investigating the glass transition of PdNi alloy nanoparticles in the solidification process.

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https://m.sciencenet.cn/blog-769813-1402457.html

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