習慣, しゅうかん
1. habit
2. (social) custom, practice, convention
その習慣は中国で始まった。
が
Particle
1. indicates sentence subject (occasionally object)
2. indicates possessive (esp. in literary expressions)
Conjunction
3. but, however, still, and
after the volitional form of a verb
4. regardless of, whether (or not)