語言誓約

language pledge (to speak only the target language in a language school)

words / speech / to say / to talk

oath / vow / to swear / to pledge

to weigh in a balance or on a scale

to make an appointment / to invite / approximately / pact / treaty / to economize / to restrict / to reduce (a fraction) / concise

dialect / language / speech

to tell to

language / CL:門|门[men2],種|种[zhong3]

oath / vow / pledge / promise