1 (railway) train

1 classroom

2 classifier: 间 jiān

1 series

2 set

1 office

2 business premises

3 bureau

4 classifier: 间 jiān

1 a series of

2 a string of

1 to be discontented with one's home

2 to have adulterous relations after marriage (of women) (idiom)

1 lit. to reach the main room and enter the chamber (idiom)

2 fig. to gradually attain proficiency

3 to attain a higher level

1 wielding the halberd within the household (idiom); internecine strife

1 to travel around many countries (idiom); peregrinations

2 refers to the travels of Confucius

1 to show the wolf into the house (idiom)

2 to introduce a potential source of trouble