一门
yī​mén

classifier for academic subjects

一门 一門 yī​mén
classifier for academic subjects numeralmeasure word
Used for branches of knowledge, courses, or academic subjects

我第一个学期就退掉了一门课。

wǒ dì​yī ge xué​qī jiù tuì diào le yī​mén kè.

I dropped a class my first semester.

例如，假设你想学一门外语。

lì​rú, jiǎ​shè nǐ xiǎng xué yī​mén wài​yǔ.

For example, suppose you want to learn a foreign language.

one family
The entire family or clan; all members belonging to the same household
the same sect
Originating from the same school of thought, religious sect, or teacher
classifier for heavy artillery
Used for heavy artillery pieces like cannons or mortars
classifier for marriages or relatives
Used for matters regarding marriages or relatives
one door
A single entrance, portal, or gateway
the same category
Belonging to the same class or type of things