-----------------------------------
六時， ６時， ろくじ
1. six o'clock
2. six periods of a day (morning, midday, afternoon, evening, midnight, late night)
六点、六点钟
-----------------------------------
帰る， 還る， かえる
1. to return, to come home, to go home, to go back
2. to leave (of a guest, customer, etc.)
3. to get home, to get to home plate
返回，回家
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd