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いつか, 何時か
1. sometime, someday, one day, some time or other, the other day, in due course, in time
tbd
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訪ねる, たずねる
1. to visit, to call on, to pay a visit to
访问、拜会、拜访
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